sliding glass cabinet doors


I have a commission to build a wall display cabinet and would like some advice on the tracks.
Cabinet is 36" high, 46" wide and 6" deep. Will have 2 - 1/4" glass bypass doors. Doors will be opened bi monthly or monthly.
Rockler sells this http://tinyurl.com/78cps which I could paint outside and wax inside to ease sliding. Grainger sells track with bearings, but it's $50, out of line for this project. Custom cut glass is gonna be expensive enough as it is. I also thought I could get some UHMW plastic and route a couple of grooves in it.
What do you all think? What's the best functionality for the lowest price?
Thanks.
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