Quick update: Anyone have some sand they don't need?

So I just did some math and realized that I need at least 1.5 MILLION blocks of glass to complete Project Skywall. Problem is, other than the fact that smelting all that sand would take forever and a day, my map currently only has 500k blocks of sand in it according to Cartograph. Well, I knew I was going to resort to using INVedit at somepoint during this project, but I didn't think that I'd have to rely so heavily on it.