Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography
by Earl G. Williams
Good price
$100.99 is 8% below the $110.44 it normally sells for, and the lowest we've seen in 136 days.
- Now
- $100.99
- Normally
- $110.44
- Lowest in 136 days
- $100.99(Nov 10)
- Highest
- $110.44
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 $147.00 −31%
Against its normal price
−8% vs $110.44
The listing shows −31%. Against its normal price it's −8%.
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 28 · 136 days · 1 price change
Loading the price chart.
- Price
- Normal $110.44
- 5% or more below normal
How often does it drop below normal?
In the 136 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 1 day so far.
A count of what happened, not a prediction.
Other ways to buy
New from
$100.99
Amazon.com Services LLCFulfilled by Amazon · Seller rating 100%
More real deals in eBooks
Get this as JSONThe same verdict and prices, from the TrackPin API.
curl https://trackpin.co/api/v1/product/B00DW650NG \
-H "x-api-key: $TRACKPIN_API_KEY"const res = await fetch("https://trackpin.co/api/v1/product/B00DW650NG", {
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/B00DW650NG",
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": "B00DW650NG",
"title": "Fourier Acoustics: Sound Radiation and Nearfield Acoustical Holography",
"image": "https://m.media-amazon.com/images/I/41s30gDj25L._AC_SL500_.jpg",
"currency": "USD",
"category": "eBooks",
"category_label": "eBooks",
"in_stock": true,
"price": {
"current_cents": 10099,
"reference_cents": 11044,
"discount_pct": 8.56,
"is_deal": true,
"observed_at": 1794417156514,
"changed_at": 1794323610372,
"checked_at": 1794417156514,
"source": "stored"
},
"verdict": {
"label": "good",
"text": "Good price",
"pct_vs_normal": 8.56,
"evidence": "strong",
"stale": false,
"suspect": false,
"steady_since": null,
"sentence": "Good price. $100.99 is 8% below the $110.44 it normally sells for, and the lowest we've seen in 136 days."
},
"listing_claim": {
"label": "List:",
"listing_reference_cents": 14700,
"claimed_pct": 31,
"real_pct": 8.56,
"class": "smaller",
"observed_at": 1794324535376
},
"stats": {
"min_cents": 10099,
"max_cents": 11044,
"avg_cents": 11033,
"history_days": 136,
"price_levels": 194,
"price_changes": 1,
"distinct_prices": 2,
"lowest_at": 1794323610372
},
"history": [
{
"price_cents": 11044,
"from": 1785293293476,
"to": 1785301971971
},
{
"price_cents": 11044,
"from": 1785309525009,
"to": 1785309525009
},
{
"price_cents": 11044,
"from": 1785321446834,
"to": 1785321446834
},
{
"price_cents": 11044,
"from": 1785322678019,
"to": 1794318585126
},
{
"price_cents": 10099,
"from": 1794323610372,
"to": 1794417156514
}
],
"last_seen": 1794417156514
}
// … 189 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.