Nice 15% coupon, enter code PERFECTDAY. Unfortunately not good on coins, unless you find them listed in another category. Only good on one purchase of $25. or more, use your shopping cart if you buy more than one item. The last time they had one of these coupons a member here posted a seller with American Silver Eagles that could be bought using the coupon. I picked up few.
You could always buy actual cash, in theory. $666.67 for $570 in cash. I think seller would make $5 when all is said and done, and buyer would save $3.33.
Be careful with some of the sellers who sell discounted forever stamps! The last time we had this coupon I ended up receiving counterfeit stamps. A safer bet is buying directly from the USPS (who have an ebay account). They sell at full price plus a small shipping fee, but it will still be less than full price. Here is an article that describes how to check if one has counterfeits: https://www.linns.com/news/us-stamp...ed-states-flag-and-fireworks-coil-stamps.html
~Here is the seller who has Silver Eagles that qualify: https://www.ebay.com/itm/FIVE-5-Ran...csAAOSwtuVa9fNr:sc:USPSFirstClass!60053!US!-1 ~Platinum Proof Koala near spot: https://www.ebay.com/itm/1989-Plati...262042?hash=item2aad4eff9a:g:2qMAAOSwGNNbNod7 ~This Gold 1/2 oz also qualifies (around $50 over spot) https://www.ebay.com/itm/2007-W-Fir...692882?hash=item2aad64d4d2:g:HzoAAOSwGdhbNsHW