Petsmart carries the zoo med naturalistic terrariums for a pretty decent price (though you could try amazon and craigs list or some other sites to see if you can find better prices) and there great. Eco terra (I think thats the brand) sells roughly the same tanks but they come with all the accessories for a first time frog owner so there a bit pricier.

Both are awesome because they have front doors that allow you to reach in at the frogs level rather then reaching down on them. I dont know about all frogs but my 3 frogs have always seemed more nervous and shrink away from me when I reach down on them but they are more likely to climb on my hands on there own if I reach in at there level.

Here's a pic of both of the tanks I have. My whites is in the larger one.