Wha wha what? But you're a total geek, surely you'd be down with eBay. I agree with Frodo, know what size your fav jeans are and create a search for that brand, size, colour. Get an email listing each day, check out what the usual sell price is and if it's reasonable then put a bid in for it. Admittedly I still mess up about 1 in 3 times with getting stuff that wasn't exactly right material or size but the savings on the other 2 in 3 more than make up.
Some idiot at work decided we should decorate our office for xmas in pink, as part of a cancer awareness/memorial theme, not checking that the only thing you can buy this year appears to be a 3ft tree from most supermarkets. I'm currently knitting the longest thin pink scarf in the world for my office. Been three years since I last did any knitting, it could take a while.