Formerly "New England Serum Company", these guys rock the house. Fastest shippers anywhere (if you order on a weekday, you'll probably get it the next day. Seriously.) Remarkably inexpensive stuff for cats and dogs- they have everything, really. This company is supposed to sell to people working in the pet industry (trainers, groomers, shelters), but they any old layman order. Just be sure to order at least $50 worth of stuff, or they'll charge you a "small order fee". The products are the human equivalent of "Old Navy", as opposed to The Gap. I use them all the time. The costumes are a ridiculous price- around $8 for the largest size. Unthinkably great.