Looking for a supplier of 7x7x5" boxes for cake transport. I can find 4" high but it's too short for a two-layer cake.

Any other suggestions on how to safely transport (30) cakes for centerpieces for my neices wedding?

try this --- http://www.brpboxshop.com/index_all_bakery_boxes_with_images.html

If you can use an 8x8x5, you can find them here ... no shipping charges.

http://www.brpboxshop.com/index_all_bakery_boxes_with_images.html

Try PackagingSupplies.com. I've known the owner for many years. It may not be listed on the website, but they still might be able to help you.

http://www.packagingsupplies.com/Bakery_Boxes_White.html

1-800-536-3668