There are only about 40 mods for VB5 currently on this site nd they are listed here -
https://vborg.vbsupport.ru/forumdisplay.php?f=258
I do not ee any mention of a shopping cart yet.
There are some for VB 4.x listed on this site, bu remember this site allows only free modifications and I believe most shopping cart software is not free- a general Google search for shopping carts and vbulletin may be more useful.