Sorry I forgot to reply to this! I'm a professor of math at Willamette University, and this was a project of the math club last year. We ordered the tiles from https://www.softtiles.com/content/view/36/40/ which was quite expensive -- the total cost came to around $650. Luckily the math club applied and received funds to buy the supplies from the general student organization fund, so I didn't pay for it myself. We ordered 360 tiles, which is enough to make all the blokus pieces plus a couple extra in each color just in case. They also charged over $100 in shipping, which seemed like a lot but was more understandable once the tiles arrived-- the boxes of tiles were huge! They really do take up a lot of volume. Then we got some gorilla glue and glued the tiles together in the appropriate shapes, which worked okay. One or two of them have come apart since then and need to be re-glued, and there were a few that got stuck to the patio and needed to be pried off. It took a number of hours with between 5 and 10 people working at different times. Finally success! Since each tile is 1 ft by 1 ft, and the patio we play on has concrete tiles which are 2 ft by 2 ft, the patio serves as a good board by itself as long as you keep in mind the extra divisions. We draw a chalk outline to mark the edge of the board. This year we're planning an intercollegiate ginormous blokus tournament with 2 other schools.
