Recently the +P 135 gr has been available at VERY good prices on Gunbroker, I bought two batches from the seller in NY and everything was perfect.

I saw a couple boxes of .357 GDSB at my local Gander Mtn last night. The price was something like $29. Everything is high there. I didn't buy.

I have had the same experience as GH Jim with the bunch from NY. Good service with a good product and probably the best price per 50 that you will find; cheaper than stores sell the 20 round boxes. Don't expect them to combine on shipping. Pony up some cash and buy a case. Per the sellers, it is going up VERY soon, along with the GD 9mm they are selling.
Ed