Hi Marie-

You can buy glass block at most building supply stores. They even have it at the big box stores, although it may be special order. I recently saw the glass block in this photo (Seves 8 x 8 x 4 cross-ribbed pattern) available online from Home Depot for about $80 for a carton of 8 blocks, which works out to $10 a block or about $22.50/SF.

Good luck on your project!

Heather

Love it thank you!