many of the slim slot loads are 9.5 mm. 12.7 is what I want but cannot find a sata for $30 or less. All sorts of IDE/Pata or Apple .
I think we need some clarity here. The NCase takes a slot-loading optical drive, with a depth of 12.7mm (front bezel or no bezel, it will fit). You can also find 9.5mm variants. Both sizes are sold as "slim" drives. You are correct, the 9.5mm drives are not suitable for the NCase.
Search for slot-loading optical drive on Amazon and eBay. Some of these drives might be advertised as replacements for HP or Apple computers, but in theory, this doesn't matter apart from branding and possibly a few extra screw holes. Obviously be sure to check first.
Whatever you buy, you will need an adapter, even if you pick a SATA drive. The SATA connectors on these smaller drives are miniaturised for notebooks, so you'll be needing a slimline sata to sata connector.
I did a quick search and
this might be what you're after. It is hard to find because slim, slot-loading optical drives for notebooks are dying out. Nobody seems to want them anymore.