They do. I had to order one for my above ground pool - they are just not popular, that's why they are hard to find.
You can order a swimming pool liner on the following site: http://www.swimmingpoolliners.com/page/index?gclid=CLaJrZL03agCFQU6gwodBEUo. They have a bunch of them.
Buy a great product called Borderlines adhesive tile borders for swimming pool liners, you can find it at any pool and spa website.
RMS Adriatic
They don't make them for in ground.
There are three important construction methods for a swimming pool: concrete, vinyl liner and fiberglass. The most used construnction method for a swimming pool is concrete.
Pool liner repair tape that can be found at most pool supply stores.
Cut it to fit.
A vinyl liner, its the way they have been done for 40+ years good swimming getapool.com
You can go to Classic pool and Spa, its in your area. http://www.classicpoolandspa.com/
Try using very hot water to heat the liner..
Termites can and do cause damage to pool liners.....The trmites will come through cracks in the vermiculite and actually eat through a liner.
Using pool underlayment for your swimming pool installation provides several benefits. It helps to protect the pool liner from damage, reduces the risk of punctures and tears, provides a smooth surface for the liner to sit on, and can help to extend the lifespan of your pool. Additionally, underlayment can help to prevent leaks and improve the overall durability of your pool installation.