Water flosser · Waterpik · price guide
Waterpik Gem 5100 value
A Waterpik Gem 5100 water flosser sells for about $48 on eBay, from 15 sales between Aug 3, 2026 and Oct 28, 2026. Most sell for $30.99 to $59.44. Used ones bring $30.99, new ones $59.89. At local online auctions it has gone for $3.99.
See the numbers
| Month | Sales | Middle price |
|---|---|---|
| Aug 2026 | 4 | $47.50 |
| Sep 2026 | 4 | $54.45 |
| Oct 2026 | 7 | $44.99 |
The flip math
What one Waterpik Gem 5100 is worth to a reseller, line by line.
To keep at least 2 times what you pay, bid no more than $3.86. Above $9.27 you lose money after every fee. Run your own numbers.
Local auction prices
1 single Waterpik Gem 5100 lot closed at Kansas and Missouri online auctions we track, at a middle winning bid of $3.99.
| Closed | Winning bid |
|---|---|
| Nov 2, 2026 | $3.99 |
Selling notes
- 67% of sales shipped free; the rest charged a middle $9.99 for shipping.
- 27% sold through Best Offer, where the real price can be lower than shown.
- 7 sold in the last 30 days, 14 in the last 90.
Questions
How much is a used Waterpik Gem 5100 water flosser worth?
About $30.99 on eBay, the middle of 8 used sales between Aug 3, 2026 and Oct 28, 2026. Most used ones sell for $30.99 to $59.44 once new ones are counted too.
What does a new Waterpik Gem 5100 water flosser sell for?
New ones sold for a middle price of $59.89 across 7 eBay sales.
How fast does a Waterpik Gem 5100 sell?
7 sold on eBay in the last 30 days and 14 in the last 90. 67% of sales came with free shipping.
What does a Waterpik Gem 5100 go for at auction?
At the Kansas and Missouri online auctions we track, 1 single Waterpik Gem 5100 lot closed at a middle winning bid of $3.99, against $48 on eBay.
Is a Waterpik Gem 5100 worth flipping?
Sold at $30.99 on eBay you keep about $13.92 after fees, shipping and a returns buffer. To double your money, pay no more than $3.86 as a winning bid with an 18% premium and 9% tax.
Similar items
Waterpik 5100
Water flossersells for $46.50Waterpik WP-660
Water flossersells for $40.50Waterpik 3100
Water flossersells for $24.99Waterpik WF-20
Water flossersells for $24.99
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
- 15 eBay sales of the Waterpik Gem 5100 from Aug 3, 2026 to Oct 28, 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.