are you sure its real, you have to know the suppliers, thats hard. some fakes look almost real. ebay has no fake product checking system, but i agree there are the
bargains but when i used ebay in my younger days it was always mostly misses rather than hits.
I've seen way too many fakes on eBay so for jeans, you're paying for a long term item which will last you a long time so may as well not cheap out too much. I personally spend between $100-$200 per pair of jeans unless they're during sale season.