On this website and on my YouTube channel I will list products that I own and have used for a while. I trust these Icom accessories from eBay and elsewhere. You'll find links to these accessories below and rest assured I won't link to anything I haven't owned before. I do not link to Amazon, but I'm sure you can find some of these Icom 7300 accessories on there too.
Icom Accessories Cables and Parts
USB Cable - CAT cable. Just for CAT and Audio. (USB Audio CODEC).
Icom Accessories Microphones
BM800 - Inexpensive mic for these transceivers using a electret mic.
Yamaha CM500 - Inexpensive headset for the Icom transceivers needing a electret mic.
Icom SM-50 - One of Icoms best desk mics for Icom transceivers. This is an electret condenser microphone with convenient up/down buttons.
See my article using the BM800 microphone and the SM-50 mic. And if you are on the radio in the morning you can find me on the Breakfast Club net, 3.973 MHz and on the RV Service net, 7.184 MHz or shoot me an e-mail and I'll find you.
Icom Accessories and Misc. Parts and Supplies
DT Systems Dummy Launcher - My best antenna launcher. Totally Phenomenal!
Braided ground strap - for mobile installations.
LED - bulbs for various things.
Solar panels - Brand I use on my RV.
Portable solar panel - Brand I use
Lead acid battery - Brand I've used in my RV.
Iambic paddle - Good one in my RV.