New: a C85 stroker at 290 SMOH in Mt Orab, OH ($23,900), plus a C85-12 case, an A75/C85 crank and C-85 starters from Facebook groups, now inside the 4-month limit. Two left the market: the C85-12F core in the Livermore, CA hangar listing (ad over 4 months old) and the $4,000 C-85 crankshaft in Deerwood, MN (Barnstormers ad gone). No price moved on the main rows; the Lone Jack, MO C85-12F's Barnstormers repost asks $10,500 against $11,900 on Craigslist.
Sources checked Nov 1, 7:33 AM Central: Trade-A-Plane, Barnstormers, eBay, Controller, BAS Part Sales (formerly Wentworth), Craigslist (21 centres, 500 mi), Facebook Marketplace (14 stops, 40 mi), Facebook groups (12 picked by Rusty). Not reachable this run: AircraftForSale and GlobalAir (bot check on AircraftForSale search; GlobalAir has no engines section; not clicked through).
A part is listed only when its ad says it is for, or fits, a C-85 or a C-90. Each ad's own words are shown; nothing is inferred. Nothing here is this site's opinion.