One part came on: a C85 crankshaft with IA sign-off (make offer) in the Small continental engines Facebook group. No asking price moved. Two left the market: the C-85 in Wilmington, MA (Trade-A-Plane no longer serves the ad) and a connecting rod set of 4 in Randle, WA (seller ended the eBay listing).
Sources checked Oct 30, 6:57 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.