First run. 1 engine and 27 prop-strike part ads found on the sites checked today.
Sources checked Oct 27, first run, evening: Trade-A-Plane, Barnstormers, eBay, Controller, BAS Part Sales (formerly Wentworth), Craigslist (21 centres, 500 mi), Facebook Marketplace (14 stops, 40 mi). Not reachable this run: AircraftForSale and GlobalAir (bot check on both; not clicked through); Facebook groups (waiting for Rusty to pick which to sweep).
A part is listed only when its ad says it is for, or fits, a C-90. Each ad's own words are shown; nothing is inferred. Nothing here is this site's opinion.