NJB,
I would charge very little over cost so as to bring the customers back. You overhead is nill, I'm expecting. Maybe even give some away at the garage sale.
You will make more on the first few orders then you will for the whole garage sale.
Please make sure you have everything in place before selling.
Make sure you have some sort of liability insurance.
Health permits and sales tax certificates available.
Your product stored in an approved container.
I've learned a little about cottage laws in different states.
I'm pretty sure that your state alows gross annual sale no more then 12,000.
Please seek some tax guidance.
You will be considered self-employeed. You must file federal income tax on any income over 400. annually
You'll owe Federal, Medicare, and Social Security. You will have to set up an account on line with the Federal website.
There you attach a bank account and then you just transfer over tax payments on line if you might owe.There is also Federal Unemployment which is small and may not effect you.
Something to watch. A tax person may tell you, you are a dependent and won't owe taxes until you exceed 5-6000.
If you have put your name any of your legal documents ie. sales tax, healt permit etc. You might get nailed. I don't know how they get the info but I know it;s happened.
If you are blogging and website etc. Copy all yor permits and lic and put them in a folder when ever you do a public function like this. You might be surprised what competition is capable of.
I know I didn't answer your question but I just wanted to look out for you.
Good Luck,
Jeff