I have been sitting on stacks of PI scattered around highsec stations as various wormholes allow. This is generally not something I would consider smart, but events have favoured me.
The following graphs PI prices over the last 3 months, taken from http://eve-marketdata.com
Many PI products are showing a roughly 20% price increase since mid to late December.
I can think of 2 contributing factors to the upward pricing that occurred at this time: the jump (freighter) nerf limiting goods from nullsec; and the change to how google docs based price importing works breaking many spreadsheets.
I am somewhat pleasantly surprised as I expected the lower costs in highsec with player owned customs offices enabling lower PI costs in highsec to counter this, but the graphs above (derived from prices in game) reflect reality rather than expectations.