buying, selling on ebay, etsy or yorbin?

[Mike O]

I make and sell things that I list on all three my question is sometimes I list and it sells quick and other times nothing the things I sell are semi seasonal like mods for kids powerwheels cars, electric pocket bikes and airsoft mask defogger kits. I live in California so sales of these are steady but the rest of the country very slow idk if its weather or economy