I searched Wacky Willy's and Radio Crap and just couldn't find a suitable case...so I made my own. Out of a Rice-A-Roni box. Yes, you heard right...my $20 programmer is now mounted in a $1.49 cardboard box. Yup, the rice was good with some pork chops. It's a piece of crap...but at least it stays in place a little better. I also mounted a little toggle switch on the PCB so that I don't have to constantly unplug the power cord every time I want to program.
It's far from ideal, but I suppose it's an improvement.