I have a probe for the Boonton 91 just about free for the asking. It is a model 91-3C (electrical condition unknown - if you know how to test, tell me and I'll do it) with no screw-on tips and with a section of the cable taped for a few inches; it was probably attacked by a rogue soldering iron back in the day. It might fit in a padded envelope or it might have to go small flat-rate. Let me know if you're interested.
