Typically UArtsy/Zbrushworkshops existing pay model has been online courses. Anywhere from $80-500, depending on length and instructor. It appears they are launching a kickstarter to open their back-catalog of courses to a $10/month subscription service. Not going to have the one-on-one their online course will provide, but looks like access to all the other material the online courses are exposed. Plenty of game related stuff, though I’m not sure of any of the Game Art assets are brought into Unreal or not.
Kickstarter:
https://www.kickstarter.com/projects/1612243374/uartsy-subscriptions-affordable-3d-art-education