Well, you need 14’s. One 10” and another 8” wide. Check your stock wheels, they might fit those? Not sure what they are in a P7? But P1 stockers might?
As for a reasonable price these days? 😂
You can try UTV stuff.com, SATV,
Ebay, heck even amazon believe it or not. Just have to search and compare. Prices change all the time.