I recently bought a membership at Snogs which is the Ozzy site mentioned.
Just as a caution, it's been weeks, a number of the add-ons not functioning in v2.3.7 and no response in Thread or via DM. In fact there is barely any activity there so I would say buy a membership with caution. No big deal because it's pretty cheap and I got a couple of add-ons that work, just don't expect any support. It looks abandoned to me other than the Spaminator ones which are his bread and butter.
My opinion, focus on the add-ons available through proper Xenforo channels to increase your odds of getting support after purchase.