From a link on the r/Roll20 subreddit. Reports that their are nearly a thousand maps. Haven't looked at more than a couple yet,but for anyone interested;
EDIT: New Link:
https://drive.google.com/drive/folde...Np?usp=sharing
(Old Link: https://drive.google.com/drive/folde...UxSdVkzWlVsN3M)