heh, thanks! Hmm.. The short top was a lucky Goodwill find, just had to take it in to fit me. I bought it before I even knew what steampunk was. Just knew I'd use it someday. The pants were just normal canvas slacks that I altered into breeches and dyed. The corset I made with some leather I bought at a flea market and a pattern I made from a roll of paper. The boots were on sale at..erm..maybe Famous Footwear? They're Mudd brand anyway. And I made the monocle from bits I got at a fleamarket.
I guess this wouldn't help you much if you need a costume soon. I'm not too familiar with places that sell steam-punk type items. I guess I'd recommend starting out with a basic design for a costume, then haunting thrift stores and flea markets. Flea markets can be treasure troves of steam-punk wear and equipment. Years of pack-rat activity went into my costume, and I'm still not satisfied!