dude get someone whos experienced with ipb, download and send him the shop mod, and get some hosting and someone will install ipb, and the shop mod for you
you need to get yourself a webhost that comes with a mysql database you also need to buy an IPB license and once you've done that, you can do anything with your forum
QIOQ yoyur dumb YES You Can ADD A SHOP!!!!YES YOU CAN!!! it will just not be as compex. there wil be admin intervention and all that as in this game renders version its auttomaticly generated and done.....BAH
Look, there are some modifications out there for InvisionFree, but I've never seen one for a Store. It's still best to get off of InvisionFree, find a real host. There are a lot of free/cheap hosts that give you space, bandwidth, FTP, MySQL, and cPanel. Most cPanels have an Invision Power Board installer so you can instantly install your board. Then you can go to http://www.InvisionIZE.com and search in the Modifications for a popular modification called "IBStore", that is what GameRenders uses. You most likely will not be able to install it yourself, but it's not hard to find someone who could do it for you.
Outlaw, the creator of IBStore, has left Invisionize and asked that the admins take all of the link to IBStore down. It is no longer avavilable for download. And you cannot install IBStore on InvisionFree anyway because you need FTP access to edit the files.