I went to Home depot and bought a RIDGID tool box for $29. Then I got some Kaizen foam for this specific tool box with the 1" lid foam which can be found on eBay. Then I traced the UZI and cut it out with a long razor blade knives that you break off a section only you use the full length with cutting out the UZI profile. Works great and most discreet. Also just to note that these tool boxes were made in Israel which pretty much sealed the deal.
If you search or wait long enough you can find them MUCH cheaper than what I just posted. I got one for $75 shipped last year.
Fits a full size and several mags without even cutting slots in the foam.