101Combat Vet, the cost was about $100 with shipping if I remember correctly. I got them from the M&P Store here. As far as having someone else change the sights for you, I did it myself. I sure have no experience either. A friend of mine and myself did all of the work. You will need a good vice, a hammer, a brass punch and some patience. That front sight is in there hard!! Do a search here on the forums. There are several that have changed their own sights with good results.
Ron