Old Navy jeans in long are nice, usually about 35"-36" inseam, and they're usually less than $30. I'm 6'1", a size 4, and have a 35.5" inseam, so finding pants that are long enough is a challenge. I can't put most of my jeans in the dryer because they shrink up, so I hang them to dry upside-down by the hem to stretch the legs out. The waist doesn't stretch out that way and I can usually get another inch or so in length out of them.
The Gap also carries longs, some of their dress pants are so long, I had to go the tailor to have them shortened. My first time to ever need to do that!