So if you've read my review of the six Mega Man Mobile titles and have decided "yeah, this is right for me," then you're in luck -- at least, if you're on iOS.
Capcom has announced that the six games are now available in one bundle for a slightly-discounted price of $9.99 USD. That's basically buying five of the games and getting one free. Or roughly $1.67 USD each.
If that sounds good, you can find the bundle right here.