I have that problem too...and I tend not to shop at the stores people mentioned really (Abercrombie, Express, etc, they're pricey). Personally I try to stock up on pants n stuff whenever I go to Asia since they definitely have jeans for shorter people ^^;
If you're ever in NYC (or some other place that has them, I think they're in California too), there's a store called Uniqlo (Japanese company), and they will hem any pants you buy from them for free !!!! It's very very cool of them to do that. Sorry I can't be of more help than that!