Thanks for the information!
I thought about doing multiple domains but thought it might confuse the user when being redirected to a different website the idea is still possible but I think I'm going to look into what nicolas was talking about.
nicolas, would I be able to do something like this with the categories:
Category #1: "Fishing Shop", each item is shipped at a flat rate of $2.50
Category #2: "Boating Electronics", the user has to spend $100+ before we can ship
Category #3: "Fishing Line", spend $10 and shipping is free.
The major problem I see with this is if they order from different categories. Would there be a way to prevent this?
Thanks nicolas and Mohamed!