Ahh, fair play. I've made the same type of mistake in my late night eBay shopping. I've even ended up buying 1 or 2 things that clearly weren't what I thought they were. Anyway, no harm, no foul.
The big giveaway (other than the price) is stainless ones aren't usually painted on the outside or coated on the inside.
That said: if you find stainless ones for 9 bucks each I'll take 10 of them!