I just want to buy a protective case for my (now outdated) Moto G first generation phone. I’ve looked around the Republic Wireless site, but can find no cases! Do they still sell them? Maybe I should try eBay?
Yes and yes.
I purchased a new Otterbox Commuter case on eBay for my G1 in late December.
Republic’s online store no longer sells accessories for the Moto G1. Your best bet would indeed be eBay or Amazon.