I'm interested in all of your Kodachrome in 35mm - do you have a price in mind? I've been trying to get some for a project to do with my late mother, but it's been hard to get an honest price on any from eBay.
Hell, I'll take the 120 too if you feel like getting rid of it I already have half a dozen rolls of it around the place judging me silently, "why did you buy me to begin with man, you knew I couldn't be developed, you just liked the boxes didn't you"
Well, I've been trying to sell the 20-roll brick of 35mm k25 for $100 but haven't had any takers yet, mostly because they only wanted a roll or two (there is one loose roll left). $75? That works out to $3 per roll.
The 120 is on eBay as a lot, but I'll take it down if you buy all of it (not going to take it down so you can buy one roll however). Make offer.