Is the blog feature something that comes standard with vBulletin (I've got version 4.1.1). I think, upon initial set up, I may have somehow gotten rid of the blog feature (or, at least, a link to the blog page) and not sure how to get it back. Any help would be greatly appreciated.
The Suite is something you would have to purchase, yes. If you already purchased the vB4 Forums, then you can upgrade to the Suite for $100 after logging in to your account and going to the purchase page.
If you did happen to purchase the Suite, but disabled the blog, head over to your ACP and go to products > vBulletin Blog > make sure it is installed/enabled.
If it is not there, follow the instructions provided by Lynne