Where do you guys buy your square cake boards. I'm making a square cake for my aunt and uncles 50th wedding anniversary and I don't know where to get the cake boards. I buy most of my stuff at michaels but they don't carry them. I tried a couple places online and they are out of stock.
Help!

I bought some at a local bakery, they also sell a limited number of supplies for the do-it-yourself person. Maybe you could buy some rounds & cut them with a xacto knife.

I buy big sheet cake boards and cut the sizes I need.

I also buy the Wilton rectangular ones and cut them down. Just beware, though, that they are EXTREMELY flimsy!!!! For some reason, they don't hold as much weight as the Wilton rounds. I learned this the hard way -- I put an 8" single-tier cake on one and it drooped in the middle, causing the frosting to develop little hairline cracks all over.

So, I'd suggest double or even triple-boarding if you're using the Wilton ones. Others on CC say they use foam core, available at Michael's or Hobby Lobby in the posterboard aisle. You can cut that to the size you need.

Thanks everyone, I had thought of cutting down the sheet cake ones but the bottom layer will be a 16". I don't know why I didn't think of using foam core, think I kind of panicked when I found the cake boards out of stock.

Thanks for that tip, Indydebi -- I'm constantly learning from you!!!!

Lowe's sells a 24X24 pressed board square precut for around $4. You can find it in the aisle right next to the shelving boards. It is almost an inch thick. HTH

I have always cut my cardboards for the square. My friend finds some square ones at a bakery in Louisiana when she goes there, but they are really thick. I have lately used 1/4" foamboard and cut it. It is eaiser to cut than the cardboards.

Would you still use foamcore if using SPS? I know that LeahS says we can use Wilton boards but I'm concerned if I use the Wilton boards on the 14" layer that cracks will occur when I'm stacking.

I use the thick 1/2" foam core for large sheetcakes. If doing a large wedding for the base I use plywood then thinner foam core for the other tiers.