AFAIK eBay funds it fully so the discount should be genuine (vs sellers co-fund discount where prices are jacked to cover sellers % margins). Best to use it on top of store's own discounted prices.
E.g.
- Dyson V10™ stick vacuum cleaner $589 delivered.
- DJI Avata 2 Fly More Combo (Single Battery) $1398 delivered.
Few items on my watch list jacked up their price.