I just found what I think is the one and only Trupan supplier in Kansas City. I will be there to get some in a couple days, but he said they have 1/2, 5/8, 3/4
The place is:
Liberty Hardwoods Inc
www.libertyhardwoodsinc.com
3900 North Kentucky Avenue
Kansas City, MO 64161
(816) 231-0852