Help! Dress Form Wanted...

I would like to purchase a dress form for displaying the clothes I'm selling, rather than just hanging them on the wall or wearing them myself. The problem is, I don't really know anything about dress forms. I do know that my dream dress form is sitting in a local vintage shop with a $375 price tag on it. I also know it's not coming home with me any time soon.

So... I'd like to recruit your help. Does anyone have any real-life-dress-form knowledge they'd like to pass along? My budget is around $100 (including shipping). I'd like one that's sturdy enough to last for a least a few years. It can be new or used. I like the idea of an adjustable one, but it doesn't have to be. I'm thinking that trolling Ebay for a used one is going to be my best bet. Whatdya think?