It's weird; I buy $30 Lee jeans from Kohls these days and they easily last a year or more. Clothing is not something you have to spend a lot of money on to get something that lasts a reasonable length of time, unless you're really being penny-wise-pound-foolish by buying the very cheapest thing you can get just to save 10%, or you're extremely hard on them.
I've got jeans from wrangler and levis that are easily well over 3 years old. Most of them I purchased from Goodwill. A couple of pairs from Amazon.
Currently, I am also trying out a couple of pairs of tactical pants made by LA Police Gear - they were fairly cheap ($30.00 a pair), but seem to be pretty good quality. I only wear them for hiking, and so far for the past 6 months they've held up well. They aren't exactly "stylish" though.
If you shop Kohl's make sure to use coupons. If you pay full price there for anything, you're paying too much. They always have some kind of deals, and you can usually "stack" them. So jeans for instance will frequently be something like "buy 1, get 1 half-price". Then, you can combine that with a 15% or 20% off coupon, which they run almost every weekend. You can get those on their website, or on printable-coupons.blogspot.com, and just show that cashier on your phone at checkout. So, two pairs of $48 jeans will cost you $57.60 (after 20% coupon), or $28.80 each.
Personally, I like Lee these days. They're good quality, not as expensive as Levi's, and not as crappy as the off-brand stuff, and seem to fit pretty well.