I needed some foam trays for my Ogre army, after looking at the GW cases I found that they were only really suitable for 20-25mm bases, not Ogre 40mm bases. I had a dig around on the internet and discovered an excellent supplier of transport cases and foam trays.
KaiserRushforth Ltd are a company based in Colchester, Essex, UK.
At the moment I have only purchased some foam trays and have to say the quality of product and service is excellent. Their products include card and aluminum transport cases, spare trays to fit both their cases and GW cases. The trays come in various sizes and depths, suitable for any size of miniature.