According to
https://bitcointalk.org/index.php?action=merit;stats=sourcesI read:
Merit sources
There are 97 merit sources with a total merit generation of up to 21171 sMerit per 30 days
If I am not wrong, I remember 98 merit source.
Update:
Fortunately, today, the forum has 98 merit sources in total (from the previous figure at 130) and the total sMerits allocation for each 30 days increase to 21671 (from the previous figure at 20895).
A single MS with 500 sMerits allowance has just disappeared? Interesting!