If you do go the shop route, it might pay to download and install Turbolister. This is a free program which enables you to set your listings up in advance. When you are ready to go you just upload whatever you want to list at the time.

It also doesn't delete old listings, so you can use them for sell similars any time in the future. Much easier than taking a week or two to get your shop up to speed after you're already paying for it.