Have you tried synthetic full lace wigs? They are still versatile and can last a long time if you take care of them properly. You can even style them with heat. Because they're synthetic, they can be a bit cheaper than human hair full lace wigs. I looked a lot to find some. ChykaLaceWigs.com sells some.

You can try the lace wigs at ChykaLaceWigs.com . They're synthetic, but you are able to heat and dye them. They are full lace wigs, but they're cheaper than human hair.