From what I've been able to gather, in general the higher the continuous current capability of a 18650 cell, the lower the mAH capacity. There are a lot of manufacturers making outrageous claims regarding continuous current capability, like they consider "continuous" to be 30 seconds or something.
I did find an AceBeam 18650 protected cell rated for 3000 mAH and 15 amps continuous for sale at BatteryJunction, but they won't ship to me via mail or Fedex etc. I found a review of this battery indicating the 15 mAH rating isn't fake, so wanted to buy them but they won't ship to me in Qatar.