My fav for tangle free long wigs is epiccosplay.com, check their sale section right now for some really nice colours.
The five wits is an american seller that uses the same supplier as arda wigs, they specialize in prestyled character wigs
You can now buy directly from lucaille wigs on their own website lucaille.com, you don't have to go thru moemall anymore (theyre in australia and have higher prices for reselling them). They are awesome for hard to find colours, especially the two toned wigs.
for an even wider range of products try their taobao store http://shop33700042.taobao.com/
you can e-mail them to order directly if you list the product name and number.
other nice places to check are CCkids on ebay:
they sell wigs that fit smaller head sizes but have soft heat resistant fiber
they have some prestyled stuff and good quality for the price
There are many choices out there for wigs but other people have done lots of work reviewing them if you look for them on here and other cosplay sites. youtube is awesome to look things up on too.