I do...but not a distinct upperward trend out of of step with rising new part costs. I have always found salvage yard prices to be high. I find the best practice is to let my fingers do the walking and let the best house win. I can dig out a good list of BMW salvage yards that are on-line if interested...the only way to go...rarely will I walk through a yard anymore only to be victim of some guy behind the counter who thinks since you are there and want the part he can inflate the price. Also, I find that many times for a few bucks more it many times pays to simply purchase an OEM replacement part through an excellent distributor like BMA or up and coming Racing King...not much more and an new part.
My $0.02
George