You could always do things like aberrant spectres or something. That would also get you mystic, and using good prayer gear, you can use house teleing and recharging at the altar at your house then running back with canifis tele/fairy rings. That would atleast get you some herbs to make more p pots, which would allow you to kill abby specs with pray method, and such.
It may not be overly effective, but atleast it can get you some prayer pots if you fully run out.
(of course, this wouldn't work without the right things in your house, but you could do this on w31 and use someone elses house if necessary)
ty ill check out w99 ^^ and i couldnt camp a monster, slaying is all im gonna do til i want 99 pray ;p