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yeah they do.. I mean they can and they like to move around some. My bigger hermit changes shells regularly. Here is a cool shell website: http://www.seashellcity.com/hermitcrabs.html
I just got a great assortment on ebay for fairly little. They're not here yet but when they do I'll post back and let you know what I think. My hermits all look like they could use new homes!
Another alternative is checking out the local craft store. I found a nice assortment at Wal-mart's craft department for fairly cheap. Just make sure the shells are natural and its recommended to boil them in hot water before placing them in your tank.