It sounds surprising, but eBay isn't a bad place to buy wigs, that is if you know where you're buying from. A few good sellers are cosplaywig, cosplayanimewigs and vogue-builder. Of course you'll have to style it yourself, or bring it to a hairstylist, but it's not a bad start. The best part is, you can often find a decent wig for around $20-30. Here's some tips for buying on eBay:
1. ALWAYS check the seller's feedback, positive and negative. Take time to read through the reviews both good and bad. A "top-rated seller" sticker is good news. If the seller has less than 98% feedback I wouldn't waste your time.
2. Avoid listings that are listed as 1 cent but then shipping is $20 or so, these are usually bad news.
3. Be cautious of the following describing words. "Hot, hot sell, sale, party, sexy (or any other word like this such as "pretty"), fashion". Sometimes though sellers do sell good quality wigs and just stick these words in the title to get more search results pop up. Still be cautious of the title.
4. The price. If the wig is new under $15 it's probably too good to be true. The wig may be bad quality.
5. ALWAYS check the description of the item before you buy it, most of the time it will state what the wig's made out of, if it's heat resistant, the length, and sometimes even have extra pictures.
6. Be careful when looking at pictures!! Some people may steal photos from other sites so you may not get what you expect.
eBay IS a great place to buy wigs, but if those risks are too big for you, a well known seller is Arda Wigs. I've never ordered from them personally but I've heard they're great. You can also check out the Marketplace