Try Petsmart. I got two cages from them, the three-level is great for two or three mice. Mine is a plain black wire cage with a blue plastic bottom. The wheel it comes with sucks so you'll be able to pick a color. The house that came with mine is plain white with a green roof. Not one of those seizure-inducing hamster boxes for sure! The bar spacing is 1/2", so baby mice will be able to squeeze through. It's fine for adults though. Here's the link:
http://www.petsmart.com/global/product_detail.jsp?PRODUCTprd_id=845524441781545&FOLDERfolder_id=2534374302047888&ASSORTMENTast_id=2534374302023695&bmUID=1165291941092&itemNo=17&Nao=12&In=Small Pet&N=2047888&Ne=2
Don't worry, it comes in other colors!! The one I have is black wire with a blue bottom. You can even break the whole thing down and put it in the dishwasher. Very nice cage in my opinion.
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Kadee Sedtal
"I wish I had a dollar for every time I spent a dollar, because then, yahoo! I'd have all my money back." -Jack Handey