KR Multicase helps you figure out the most optimal foam purchases with their new TrayGuides. From the release:
Site upgrades are now all complete (for the time being!) These latest improvements add the “KR TrayGuides” for armies and games. Click the link to see them. The page lists each army, we will increase this list each week to include more of the trays from KR.
In addition each TrayGuide can be saved as a pdf file to share with other gamers, or to printout and keep on your PC – a great reference file for keeping your tray options handy.
We are working on some other major improvements which will help make choosing the best trays for your army a simpler process – they will be added shortly too.