I'm looking for the absolute smallest Mini-ITX case that has one expansion slot (half-height is fine). The case is going into a MAME arcade PC build so I don't care about aesthetics or looks. Basically I'm trying to find something cheap like the M350 Universal Mini-ITX case but with one half-height expansion slot. I also love the new ASRock DeskMini PCs and they absolutely nearly perfect if they supported just one half-height PCIe slot. Any suggestions?