I recently order a liner from poolstore.com out of Calif. They seemed to have the best price and luckily for me they drop shipped the liner from the manufacturer in NY, so I got it in 2 days since I'm in NJ.

I ordered a 20 ga liner and replaced a 25 ga. Although the 20 seems ok, it seems a lot thinner than a 25. If I had to do it again, Id get the 25 especially since the price difference is not that much.

For me the install was a frustrating experience, I tried to do it like Dennis suggested but I have a wrap around deck on half the pool, so I had to install it the traditional way. The best advice I can give about a liner install is PATIENCE.

Good Luck
Anthony