if you are only wanting the slide, you can do it yourself with a file, some 320 paper and a glass bead blaster. you will lose the lettering. just break all edges to taste, being careful in the cutout for the slide stop to engage (as too much removal in that area could affect lockback on an empty mag)
you will have to remove sights and all components as the powder filings will get into every knook and cranny.
if you require the frame to be dehorned, it will require stripping of the anodizing after you dehorn the frame and then re anodizing.
I am sure there are other techniques, but this worked for me.
good luck