In my experience, the choices for suitable storage/travel cases for Adult collectors are somewhat limited and often rather costly for the most popular options. But I just found this on Amazon and thought it was worth sharing...
Looks like the perfect carrying case to carry 20 high-end racers in secure, padded comfort. For air travel, it's small enough to pack inside a carry-on bag and easy enough to quickly access and display to NTSA officials, since all of that metal will typically draw thier attention. Not a bad deal for $14.99.