Costumes from the best Halloween Stores - Hazboo.com Search for Halloween costumes, masks and more   Have fun searching Hazboo.com for all your favorite Halloween items.  We have over 14,000 costumes, masks and gifts from the best Halloween stores online.  Here are some fun items that you may not think to search for: Baby costumes - just check out those adorable pictures!  The weirdest has got to be the baby whoopie cushion costume.  That poor kid!  Also pretty strange is this baby pizza costume! The best selling costumes here are the Harry Potter costumes.  It's a natural choice, and some of the official Harry Potter costumes here are incredible.  However, if you want to stand out of the crowd then how about dressing as Hagrid, or Dumbledore?