4 double chests of sand + single chest of coal = 4 double chests of glass = 32r per stack of glass + coal cost = YES Not everyone wants sand for sandstone. If people wanted sandstone, I'd sell sand stone. And fyi 729 buys sand at 48r per stack, 1783 buys sand at 36r per stack
You do know the price for coal, right? One stack is about 80-90 on average.. EDIT: 128 per stack at 1783 for coal. Just an example.