I ordered a plug for the depth transducer for my (very old) Garmin GPS. It was a quality product (made by Airmar) and arrived amazingly fast. But, I emailed a question about how to assemble the parts of the plug and never got a reply. I emailed Airmar and they answered the same day with photos and all.
Circling back to this thread. I purchased a radar, bracket, Balmar alt and ext regulator and a Balmar Sc200 from IMarine. The only issue I had was they sent me a wrong shipping number with one of them and had me the right one within minutes of the inquiry. I couldn’t be happier with them and they ( at the time of the purchase) had the lowest prices be far.