i know a surefire place to get one.
go to trynton and find the waterfall (it splits into two falls). jump in and at the base of the left hand one is a nice, shiny RoP, just waiting for someone to come and grab it!
if you stay in the river, you can either climb back up at the base of the bridge or just go over the falls into the water below. stay next to the cliff, go to where the fishing rod is and grab the line. it will lift you back up to ground level. if you go a tad further down first tho, there's some potions in a little nook.
V***V