Oh you lucky dog! That 28mm is legendary, and so is it's price!That's a great tip. Thanks.
Interestingly, I've had great luck at my local shop that develops film (B&W). They have a consignment case in the back and over the last few years I've found some great stuff there. The latest was a mint K mount SMC 28/3.5 for $60. They even let me try it out for a week in case I didn't like it.