Yes, I have this issue.
I use these for "work" pants. They are the best around and have an extra gusset built in.
Duluth Trading Company's exclusive DuluthFlex Fire Hose 5-Pocket Jeans have all the features of the original Fire Hose Pants but weigh about 30% less.
www.duluthtrading.com
For regular jeans I just buy some stretchy ones and resort to replacing them fairly often. I got some Lucky jeans from Costco or Sams (can't remember which) for like 30 bucks and they lasted a decent amount of time.
I wear shorts when it's warm out, even at my day job, so I'm ok replacing a couple 30 dollar pairs a year.