Well, I guess that would depend on where in the country you are...
If you happen to be in the Dallas-Ft. Worth area, Verizion has the Verizon Experience Store (I think that is what it is called) in the Southlake Town Center where they have FiOS internet and TV available for demo.
There may be other places in Verizon areas around the country but I don't know where they would be. You might try the Verizon web site, find locations in your area, and call. You could I guess also call a local Best Buy or Circuit City and see if they have it.