AC compressor threw a bearing i think..

[Hellz]

so this weekend it started hearing noise from the engine compartment.
tonight, i tried tracking it down, but still dont have a clue. the general area seems to come from the AC compressor area.

i thought maybe the serp belt was going out, or was sqealing, but after some belt conditioner, and WD40 in some areas, A. it got louder and B still no clue..

im not 100% its the AC.
at idle, i hear nothing but the normal engine.
raise the RPMs to 700 to 1000 and i get "chrips"
raise the RPMs from there and the chirping gets faster till its sounds like a sqeak.

if it is teh AC compressor.. anyone replace thiers? DYI or mechanic? costs?