Are you looking for a pre-styled wig or just a brown wig you can style yourself?
For a pre-styled wig, you'll probably want to look for a commission. (Depending on when you'd need it by, this is something I would be interested in.) Or, you could also look around for a used wig on places like Cosplay.com's Marketplace.
For a plain brown wig, you can look at a lot of different places. Honestly, I'm not sure why you're against eBay--I find the best prices, fastest and safest shipping there! Zhenna in particular is an excellent seller that only takes two weeks to ship, Wigmad, powersellergrm, and cosplaygoods are all great too.
BUT if you have reasons for not wanting eBay, then you can try Cosworx. I'm really not keen on them because I have friends who have had horrific experiences with them--products did not arrive or weren't as described and then they could not get the situation resolved for months--BUT, alternately, I have had friends who have had wonderful experiences, too. http://www.cosworx.com
They have a really huge selection, but they do run steeper than ebay.
Amphigory is another site I've heard good things about.
Hope this helps!