Of course you can buy a new liner. There are many places even online where you can find a liner from for cheap. As for the connectors, I am pretty sure there are quite a few places as well that sell those connectors. I would check out like swimmingpoolliners.com for the liner. Its actually quite cheap for shipping considering they weigh so much. As for the walls, call their company, if they can't get you what you need they could prolly recommend something. Ive had some good experiences with them. I bought a kayak pool a few years back and they have helped me with it every step of the way.
O.K. THANKS. THIS HAS BEEN A NIGHTMARE OF A PROJECT.