If there's a buy/sell/trade board in your area, check it out to see what both of those sell for around you. If that doesn't work, try Gunbroker.
If Glocks sell for more, then perhaps your friend will sweeten the deal with a little cash or something else of value.
But ultimately, if you're happy, you're happy.
"An armed society is a polite society." ó Robert A. Heinlein
"After a shooting spree, they always want to take the guns away from the people who didn't do it. I sure as hell wouldn't want to live in a society where the only people allowed guns are the police and the military."
ó William S. Burroughs