I make my own grips and a while back got a bug about making some and having a logo laser etched on the grips.
There are several places on the net that will laser engrave stuff, including pistol grips. I did not feel like sending a set away and waiting and all of that stuff. One day I went into my local sporting goods store, which does trophys & engraving, and noticed a sample wood plaque on the wall that was laser etched. I asked them where they got their laser engraving done and they said that they did it there! I live in a real small town, basically, the Super Walmart is the best (the only) thing in the whole town.
They engraved my grips with a custom logo I made on Corel Draw. I gave them a 3 1/2" disc with the file and bam!, engraved on my grips - $12.
I would suggest a little hunting around where you live. Look at trophy shops or sporting goods stores. You might just get lucky.