I don't know how pricing scales on larger pieces, but I got 2 sheets of glass in the ~10"×12" size (1/4" tempered with the smooth edges), used for sliding doors on a 20 gallon high, for about $15.

Might be that it is more expensive off of larger sheets, but I really don't know. Seems high to me, but glass might be more expensive where you're located.

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