Yeah, BuyCostumes.com has a pretty good reputation. The only thing I'd watch out for is when buying clothing or costumes, be sure you know the right size. They do not do exchanges for clothing, only returns. That means if you purchased an item that ends up being too big or too small, you have to return it and YOU pay for shipping and handling. Then you have to place a new order for the item in a more appropriate size (and hope that they still have it in stock).
Their Lighting Effects Box is at an excellent price, and it is a great item (as you can read in my review - PirateHaunter). But the best price for this item is still at
SPILSBURY.COM and their service is top-notch. In fact, now that you mention it, maybe I should pick up a few more at this price!!