[Patton250]

Get the USG, you'll like the fixed sights.

Where can I pick one up and what is the most I should pay?

 

[hillbillyjim]

you wont get one new so probably have to settle on gunbroker

LNIB - FNH Five-seveN USG 5.7x28mm Black 3 Mags : Semi Auto Pistols at GunBroker.com

here is one

 

[LESTER]

Trying to find a new USG with fixed sights may be a little difficult but not impossible keep looking here in the market place and on GB! $1200.00 is a fair price!
Or you could go on highplains back in stock notification list and buy a new MKII :mytwocents0:

 

[Dizzy82]

Here's a black, fixed sight USG:

FN HERSTAL FIVE SEVEN USG 5.7x28 MM PISTOL LNIB : Semi Auto Pistols at GunBroker.com