You have several issues. Federal and State taxes, and maybe a vendors issue?
I use to do ebay on a small scale, REALLY. But the Feds have been trying to regulate ebay for some time. It is loss taxes, but herp sales unless you are doing a LOT would be hard to trace. Add in your costs, if a "legit" business, you can make it look like you are in the red even if you make money. Again, unless you have a lot of stuff, and high end stuff.
Maybe talk to a tax person on extra personal income? They should know.
I'm going to be getting back into breeding mice and rats on a fairly good size scale. I'm debating to make it legit. But for other reasons, not to cheat taxes. I will be raising my stuff where I work. If I legit, I can deduct my gas to go take care of my critters and then, oh yea by the way, go to work. It's 60 miles! Plus a few other reasons.
This IS NOT legal advise, but I have stayed at several Holiday Inn Expresses in my days!