If you are a member of the Makeupalley forums, they have a fashion swap yahoo group that you can join. Generally its best if you already have some swap tokens under your username there, though.
I've never tried consignment, but I know some people have great luck with it!
Also, no need to be scared of ebay, just have some sort of policy clearly stated where you will not accept bids from users with 0 or negative feedback unless they email you first or something.