The Hearing Club for Flexstrips $20-a-pair → https://www.thehearingclub.com/Programming-Adapter-choose-size-10-312-13-or-FLEX-STRIPS-Comes-with-two-adapters_p_285.html16
Though, watch out because you may end up ordering programming pills by mistake. The two are side-by-side and are very difficult to distinguish which one you are ordering.
mini-Pro Aliexpress/seller ForSound
Hi Pro EBay - Make sure it’s USB, I saw a serial Hi Pro (with no cables-nothing but trouble) for sale on EBay.
CS44 cables?? I dunno? All I see on EBay are Phonak CS44a cables which have pins 3&4 reversed. Maybe these are getting hard to find?
Tip: when searching add “hearing” to help find cables for hearing aids.