what's a good shopping cart
 

Going to be building a couple sites selling collars with semi precious gems on them, people, cats, dogs. Going to have a build a collar feature.
Figure the Collars for people would sell well with the Dom and Sub market.
I like free, but if a good one has to be a paid one, that's ok too

I used to use Zen Cart....that was some time ago, though.

i see many sites using prestashop these days.
also one is hosted , cant recall its name but they chatge from 50 bucks / month and handle everything for you.

edit: its shopify.

also few successful sites using Magento .

I used that once years ago. Don't remember much about it, but it did work

what billing you use ? I used Hipay but they delayed with payments, now looking for new payment gateway and I have problem because most of them don't accept adult or I can open merchant account but must generate min $30-40k monthly

This is a non adult project, selling goods here