Limiting the number of sites a user can create


First off I just want to say thanks for this site and all the incredible themes and plugins! It makes setting up a membership site a bunch easier for us "not so technical" types.

Question: I'm trying to figure out how to limit the number of sites a member can create, per level. I've done a search, and most of the responses are more than a year old, so am wondering if there has been any functionality added to Membership or ProSites that will do this?