http://www.amazon.com/AirSplat-Shoulder ... B0006N07YU
http://cgi.ebay.com/UTG-PISTOL-SHOULDER ... dZViewItem
Amazon - $29+9 shipping
Ebay - $15+5.50 shipping (this is the exact seller i bought mine from on ebay)

Pros - It's much more comfortable than the other holsters i have because of the wide shoulder pieces that dispurse weight of the weapon and ammo over a large area.
Very adjustable and modular. If you didn't like the provided holster or ammo pouches you could get basically any nylon strap holster and swap them out.
Has quick-release buckles for easy detachment of sections
The safety (thumb) strap is adjustable with velcro and has TWO buttons on it for extra safety, though you can easily just use one if you prefer.
The holster itself is universal for any large frame pistol
The belt loops that come attached to both sides are easily wrapped around the holster and mag pouch and velcro in place to get them out of the way if you're not going to use them.
can easily be swapped for left and right handed draw.
Having the weight of the mag pouches to balance out the weight of the gun really helps in the comfort level.
Because I'm a big bumpy guy I can even wear this rig under a t-shirt and still maintain reasonable concealment. I've done it about 10x in public thus far and once in front of a LEO with nary a look.
Cons - I'm not sure how long the elastic between the two wide shoulder pieces will hold out, but that's easily fixed by sewing another piece of nylon over it if it breaks
I wish there was a strap across the back to keep both sides from lurching fwd when you bent down. I've seen this in higher end holsters and I may just add it to this one. Nylon is cheap and easy to sew and I have tons of it.
Overall, for the money it's a decent holster.