In rimmington and in yanille oak trees are just next to the POH, so bring a wc axe, and gain wc exp + con exp , and if you bring a ring of wealth, gain some nests as well
and a demon as well

the calulations with a demon are :
14000/24=584
number of payments : 584/8=73
Price for the trips : 730000
sawmill : 3500000
total : 4230000 leaving about 5770K for the oaks !
Did i mention it is a nice guide ? 10/10