I use the time-honored technique of walking into a sign shop, describing what I want, and hoping they get it right. Usually they do a pretty good job if I'm not asking for something too fancy (like Emmie's blue Tarheel numbers). It's been a while since I've ordered a full set, but I'd guess for what you want you'd be looking at a bill in the $30 range. Don't quote me on that, I'm just trying to provide a ballpark figure.
For cheaper and/or more clever ways of doing magnetics, someone else will have to speak up.
Good luck!
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Carl Fisher
Be Cool to the Pizza Dude:
http://www.npr.org/templates/story/stor ... Id=4651531