Jon,
I use the ICS advertisers from the Home Page and start calling and I also Google.
None of the Comanche focused shops have all their inventory online so I call or direct email.
I start with Matt Kurke because he contributes so much to correct Comanche maintenance at comanchegear.com, then Webcoaircraft.com, the Parts guy Phil is also a talented mechanic - you can tell him I said so
, then ASOD.com where nationally known talent Lucky Loque lives. All really great folks.
Then I go to the Preferred Parts etc.
Hope one of these has what you are looking for - I've sourced parts from all of them and eBay too.