I did some repairs recently and have some Baltek 3/4" SB100 balsa core material left over. These are 24" x 48" sheets.
For more info on this material go to
http://www.atlcomposites.com.au/files/products.cores.baltek__end_grain_balsa/baltek_sb.100.pdfBaltek will only sell this by the box (17 sheets) and it's way more than needed for most jobs. If you need some give me a call. I have 13 sheets left. $25 per sheet (my cost).
Brad Stokes
361-944-1323
pbstokes@aol.com