What I've heard from the smart guys is that the MPF102 is specified with a pretty broad range of parameters, so lots of other JFETs will fit between those ditches.toggle quoted messageShow quoted text
I'm liking the 2N3819 too. I bought 25 from Mouser for 9 cents apiece a while back.
A quick eBay check shows quite a few MPF102s. One outfit I'm familiar with is Nightfire Electronics. They sell a "kit" of 10 MPF102s for $8.99 and throw in a bunch of other components and a little perf board to fill out the "kit" idea. Not bad if your junk box is a little light.