Water flosser · Waterpik · price guide
Waterpik 5100 value
A Waterpik 5100 water flosser sells for about $46.50 on eBay, from 18 sales between Jul 29, 2026 and Oct 18, 2026. Most sell for $32.99 to $59.67. Used ones bring $31.99, new ones $59.89.
See the numbers
| Month | Sales | Middle price |
|---|---|---|
| Jul 2026 | 1 | $64.99 |
| Aug 2026 | 4 | $47.50 |
| Sep 2026 | 6 | $44.50 |
| Oct 2026 | 7 | $44.99 |
The flip math
What one Waterpik 5100 is worth to a reseller, line by line.
To keep at least 2 times what you pay, bid no more than $4.43. Above $10.41 you lose money after every fee. Run your own numbers.
Selling notes
- 67% of sales shipped free; the rest charged a middle $9.08 for shipping.
- 28% sold through Best Offer, where the real price can be lower than shown.
- The last 60 days are steady against the 4 months before.
- 7 sold in the last 30 days, 16 in the last 90.
Questions
How much is a used Waterpik 5100 water flosser worth?
About $31.99 on eBay, the middle of 9 used sales between Jul 29, 2026 and Oct 18, 2026. Most used ones sell for $32.99 to $59.67 once new ones are counted too.
What does a new Waterpik 5100 water flosser sell for?
New ones sold for a middle price of $59.89 across 9 eBay sales.
How fast does a Waterpik 5100 sell?
7 sold on eBay in the last 30 days and 16 in the last 90. Prices are steady against the months before. 67% of sales came with free shipping.
Is a Waterpik 5100 worth flipping?
Sold at $32.99 on eBay you keep about $15.39 after fees, shipping and a returns buffer. To double your money, pay no more than $4.43 as a winning bid with an 18% premium and 9% tax.
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Have one? Look it up
Snap a photo or scan the barcode and see what yours sells for, new and used, with every fee counted.
Look up yoursHow we got these numbers
- 18 eBay sales of the Waterpik 5100 from Jul 29, 2026 to Oct 18, 2026, each one checked to be this model (at least half name it in the listing; the rest match it closely).
- eBay prices are completed sales (what buyers paid), not asking prices, from our sold-data provider. We keep only sales of the same product: parts, accessories, bundles and look-alikes are dropped before anything is counted.
- Local auction prices are winning bids on single-item lots at the Kansas and Missouri online auctions we track (HiBid and Equip-Bid sellers), read by our own lot reader. Lots of several units are left out.
- The money math uses our standard costs: 18% buyer's premium, 9% sales tax, a $2.00 lot fee, eBay's 13.6% + $0.40 fee, shipping at cost (never counted as profit) and a 15% buffer for returns and duds. Members set their own.