So, I'm probably going to return the Onyx. The twist shifter is bothering my wrist and it just seems sluggish overall...

I agree that my Hard Rock Sport is not in the best shape. I did ask for a rough number and to get it back in good shape, probably looking at $300 ish.

So, I'd like to get either a used or new bike for my commute. Something solid and that can take potholes/road hazards because I've gotten a few flats...

I'm not sure where to go. Would a bike shop be the best option? Facebook marketplace seems like it can be hit or miss and who know what the true shape of the bike is? Perhaps better to check local bike shops?