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Tetra Whisper Bio-Bag Large Filter Cartridges for Aquariums, 12 Count | Ready to Use, Fits Tetra Whisper Fish Tank Filter 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60, Replace Monthly

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Rated4.7(13,329 ratings)Only 18 left

Great price

$58.41 is 22% below the $75.30 it normally sells for, and the lowest we've seen in 139 days.

Now
$58.41
Normally
$75.30
Lowest in 139 days
$58.41(Nov 11)
Highest
$75.30
Evidence: Strong139 days tracked10 price changes

Where today's price sits

View on amazon.com (opens in a new tab)

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.

Get an email when the price drops

Good: 5%+ below normal. Great: 20%+ below. One email when it happens, at a price below today's $58.41. No account, no newsletter.

The listing's crossed-out price

Holds up

The listing shows

crossed out: Typical $75.30 −22%

Against its normal price

−22% vs $75.30

Typical $75.30 (−22%) holds up: today's price is 22% below normal.

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 25 · 139 days · 10 price changes

Loading the price chart.

  • Price
  • Normal $75.30
  • 5% or more below normal

How often does it drop below normal?

In the 139 days we've tracked it, it stayed 5% or more below today's normal price for an hour or more 5 times, typically lasting less than a day. It's below normal right now.

A count of what happened, not a prediction.

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Get this as JSONThe same verdict and prices, from the TrackPin API.
GET/api/v1/product/B08FCX6P7Q
Request
curl https://trackpin.co/api/v1/product/B08FCX6P7Q \
  -H "x-api-key: $TRACKPIN_API_KEY"

This is exactly what the API returns for this product. Free keys include 100 requests a day.

Request a key
Live response, As of 21:56 UTC
{
  "asin": "B08FCX6P7Q",
  "title": "Tetra Whisper Bio-Bag Large Filter Cartridges for Aquariums, 12 Count | Ready to Use, Fits Tetra Whisper Fish Tank Filter 10-30 Gal, 20-40 Gal, PF-20, 30, 40, 60, IQ 20, 30, 45, 60, Replace Monthly",
  "image": "https://m.media-amazon.com/images/I/61Be303O6GL._AC_SL500_.jpg",
  "currency": "USD",
  "category": "Pet Products",
  "category_label": "Pet Supplies",
  "in_stock": true,
  "price": {
    "current_cents": 5841,
    "reference_cents": 7530,
    "discount_pct": 22.43,
    "is_deal": true,
    "observed_at": 1794433092431,
    "changed_at": 1794426260350,
    "checked_at": 1794433092431,
    "source": "stored"
  },
  "verdict": {
    "label": "great",
    "text": "Great price",
    "pct_vs_normal": 22.43,
    "evidence": "strong",
    "stale": false,
    "suspect": false,
    "steady_since": null,
    "sentence": "Great price. $58.41 is 22% below the $75.30 it normally sells for, and the lowest we've seen in 139 days."
  },
  "listing_claim": {
    "label": "Typical:",
    "listing_reference_cents": 7530,
    "claimed_pct": 22,
    "real_pct": 22.43,
    "class": "holds_up",
    "observed_at": 1794433093460
  },
  "stats": {
    "min_cents": 5841,
    "max_cents": 7530,
    "avg_cents": 7509,
    "history_days": 139,
    "price_levels": 192,
    "price_changes": 10,
    "distinct_prices": 4,
    "lowest_at": 1794426260350
  },
  "history": [
    {
      "price_cents": 6079,
      "from": 1791403588010,
      "to": 1791404648008
    },
    {
      "price_cents": 6079,
      "from": 1791407221973,
      "to": 1791407221973
    },
    {
      "price_cents": 6079,
      "from": 1791429687504,
      "to": 1791429687504
    },
    {
      "price_cents": 7530,
      "from": 1791443311953,
      "to": 1794420851542
    },
    {
      "price_cents": 5841,
      "from": 1794426260350,
      "to": 1794433092431
    }
  ],
  "last_seen": 1794433093460
}
// … 187 more steps in the full response

Normal 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.