Instead of busting the guys chops, how about first finding out if there is a reason why the tanks go for a higher price? May be that he is using better materials, or manufacturing process than others? Also remember that materials prices go way down when you are buying in volume.... glasscages does large volumes of sales... they probably also get a sweetheart deal on their materials.
Bottom line, you don't like the prices, you don't have to buy... but there is no need to be rude.
+10
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