Recently fohat and wcass have been producing threads on modding old style 3-step legs for terminal keyboards so that the casings are usable on the F122.
This inspired me to look around for more listings for old style casings with 3-step legs. A plus is, if you don't have an F122 and don't want an F122, at least you can still get an M122 that looks exactly like an F122. (Additional plus: The 3 step legs are awesome because they lift the keyboard really high.)
http://www.ebay.com/itm/161130396289?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649Only $38 shipped right now. This looks pretty clean for a terminal. The shrink wrapping doesn't look too tight. In any case if you're buying for the casing only...
http://www.ebay.com/itm/111187059812?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649I know this seller. She ships well and should be ok with $35 shipped so go ahead and make an offer for half her asking of $50.