What about a used iRiver 120/140? I haven't checked prices in a while, but I've seen them on eBay. It's not quite as good a recorder as the JB3 (I have and use both machines for different things) but it's small, doesn't need an external pre (although it can take one and run line-in if you want) and is a good little machine if you want small and don't mind the write-back glitch (small "pop" when it writes back to hard drive - some people notice it, some people don't depending on what they're recording) and the fact that it has a file-size limit before you have to start another track manually (it won't record continuously like the JB3). Of course, now that the Rockbox firmware is in train, some of those "problems" may get fixed over coming months anyway, at which point it's a GREAT 16bit stealth unit.
For the record, I greatly prefer my iRiver/JB3 to MD on all fronts - no comparison, particularly for ease of use (no media to schlep and can upload easily to puter) AND overall sound quality.
HTH.