Not the cheapest, but you did say good.
http://www.use-enco.com/CGI/INSRIT?PMAKA=317-7316&PMPXNO=19500721&PARTPG=INLMK32
Yeah you just never now if these things are bent or not. Im only really looking for an F bit. Im trying to make bic stick pens and I mic'd the nib barrel at .257 which is the F bit size. I already have a new 5/32 bit for the ink tube.