OK.....so now that we now that you're the shop,.....FK's and the P series Looks are in hot demand. Very popular binding as they are no longer made, with the freeskiers. All metal, light, etc. You probably know that. They sell pretty frequently on TGR, and on this forum. That's the downside. A good pair of FK155's will bring $130-150, an pair of FK185's will net $175-200. NIB is more.
I know where you can get some NIB P18's but they'll run at least $250 with shipping.
I'd look around for an older pair of Fischer GS or SL skis, and strip the plates and the bindings. As you probably know, before the deal to brand Tyrolia's as Fischer for their product, a lot were mounted with Salomon's. You might find a delam pair of SL's, etc., and be able to pull this off for closer to $100. Just my $.02.
Post a WTB in the Gear Swap forum. Might be a start.