you can also make your own wig from fur pretty cheaply. personally i don't like those too much, but if you want a wig from like a remnant of faux fur found at your local joann's or whatever, they're very quick and easy to make.
taobao is where i'm looking for my next round of wigs - they're like 5-10 dollars (plus cost of shipping to taobaospree, and then finally shipping to me in the usa), so not really practical if you want just one or two things. but i'm doing a big stockup of dolly stuff for my belated birthday/christmas so it works out.

i really do like the monique gold wigs tho, and i'd say look around and see if anything strikes your fancy there!
