Teaching Skills with Virtual Humans: Lessons from the Development of the Thinking Head Whiteboard (Cognitive Science and Technology)
by Marissa Bond
Good price
$130.30 is 6% below the $139.16 it normally sells for, and the lowest we've seen in 139 days.
- Now
- $130.30
- Normally
- $139.16
- Lowest in 139 days
- $130.30(Nov 11)
- Highest
- $161.95
Where today's price sits
Prices change. Confirm the price on Amazon before you buy. TrackPin may earn a commission if you buy, at no cost to you; it never changes a verdict.
The listing's crossed-out price
Smaller than shownThe listing shows
crossed out: List $169.99 −23%
Against its normal price
−6% vs $139.16
The listing shows −23%. Against its normal price it's −6%.
The crossed-out price is the reference shown on the listing. We don't know how it was set; we only compare it with prices we've observed. How we check →
Price history
Tracked since Jun 24 · 139 days · 142 price changes
Loading the price chart.
- Price
- Not checked for 3+ days
- Normal $139.16
- 5% or more below normal
How often does it drop below normal?
In the 139 days we've tracked it, this is the first time it has stayed 5% or more below today's normal price for an hour or more. It has been below normal for about 6 days so far.
A count of what happened, not a prediction.
Other ways to buy
New from
$130.31
ShopSpell USSeller rating 89% of 4,895
Used from
$155.58
BOOKS etc. _Seller rating 78% of 22,985
11 of 14 offers
| Seller | Condition | Price | FBA | Seller rating |
|---|---|---|---|---|
| ShopSpell US | New | $130.31 | No | 89% of 4,895 |
| allnewbooks | New | $131.98 | No | 83% of 254,354 |
| EV Asset FR | New | $153.19 | No | 74% of 396 |
| BOOKS etc. _ | Used - Like New | $155.58 | No | 78% of 22,985 |
| BOOKS etc. _ | New | $155.59 | No | 78% of 22,985 |
| Amazon.com | New | $160.12 | Yes | 100% |
| Windy Books | New | $166.84 | No | 65% of 19,668 |
| booksXpress | New | $166.84 | No | 65% of 37,286 |
| Cyprus City Sales | New | $186.95 | No | 72% of 1,613 |
| betterdeals2019 | New | $189.87 | No | 53% of 9,402 |
Showing the 10 lowest of 11 offers.
Amazon lists 14 offers. These are from the first page of its offer list, sorted by price plus delivery, so a lower price may be further down.
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Get this as JSONThe same verdict and prices, from the TrackPin API.
curl https://trackpin.co/api/v1/product/9811623147 \
-H "x-api-key: $TRACKPIN_API_KEY"const res = await fetch("https://trackpin.co/api/v1/product/9811623147", {
headers: { "x-api-key": process.env.TRACKPIN_API_KEY },
});
const product = await res.json();
console.log(product.verdict.label, product.price.reference_cents);import os, requests
r = requests.get(
"https://trackpin.co/api/v1/product/9811623147",
headers={"x-api-key": os.environ["TRACKPIN_API_KEY"]},
)
product = r.json()
print(product["verdict"]["label"], product["price"]["reference_cents"])This is exactly what the API returns for this product. Free keys include 100 requests a day.
Request a key{
"asin": "9811623147",
"title": "Teaching Skills with Virtual Humans: Lessons from the Development of the Thinking Head Whiteboard (Cognitive Science and Technology)",
"image": "https://m.media-amazon.com/images/I/61td9j2d3KL._AC_SL500_.jpg",
"currency": "USD",
"category": "Book",
"category_label": "Books",
"in_stock": true,
"price": {
"current_cents": 13030,
"reference_cents": 13916,
"discount_pct": 6.37,
"is_deal": true,
"observed_at": 1794403629479,
"changed_at": 1794379982407,
"checked_at": 1794403629479,
"source": "stored"
},
"verdict": {
"label": "good",
"text": "Good price",
"pct_vs_normal": 6.37,
"evidence": "strong",
"stale": false,
"suspect": false,
"steady_since": null,
"sentence": "Good price. $130.30 is 6% below the $139.16 it normally sells for, and the lowest we've seen in 139 days."
},
"listing_claim": {
"label": "List:",
"listing_reference_cents": 16999,
"claimed_pct": 23,
"real_pct": 6.37,
"class": "smaller",
"observed_at": 1794393482372
},
"stats": {
"min_cents": 13030,
"max_cents": 16195,
"avg_cents": 14030,
"history_days": 139,
"price_levels": 328,
"price_changes": 142,
"distinct_prices": 7,
"lowest_at": 1794379982407
},
"history": [
{
"price_cents": 13916,
"from": 1793595256053,
"to": 1793595256053
},
{
"price_cents": 14208,
"from": 1793599810583,
"to": 1793678000522
},
{
"price_cents": 13916,
"from": 1793681642648,
"to": 1793896751990
},
{
"price_cents": 13198,
"from": 1793900178341,
"to": 1794375492631
},
{
"price_cents": 13030,
"from": 1794379982407,
"to": 1794403629479
}
],
"last_seen": 1794403629479
}
// … 323 more steps in the full responseNormal price: the lowest price level the product held for at least 15% of the last 45 days (about a week). Prices within 3% of each other count as one level, and we use the lowest price in that level. How we calculate it → Prices are observations of amazon.com and may be incomplete or delayed. TrackPin is not affiliated with Amazon.