What would we do without the InterNet. This time I have found a great WebSite for blast media that is specifically for "wet blasting" at:

http://www.thomasnet.com/products/abrasives-wet-blasting-150409-1.html

Where there are 15 different manufacturers/suppliers and 9 of these have their own website to further research the subject.

I still think the 25 lbs of 24-grit walnut shells at Harbor Freight will be hard to beat.

Sam