Not sure what you are going to pay for 12mm-1/2" out there my cost is around $10 a square but I work with glass. I can tell you that low iron glass will be about double.
Look at the large tempering places out in Calgary they will get you the cheapest glass. (This is where the smaller shops get their glass from)
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150 Gal system 3'x3' 400W M/H, Bekett skimmer, Dart return,1/4 HP Chiller
180 Gal Drop tank, LED lights, Bubble master 250 skimmer,Hammerhead on a closed loop, Speed wave return.
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