Keekoi, it was just my friend and I, usually we go 3 max. Once on a club dig, it was chaos, there were like 50 people (including some crazies that drove down from NorCal) and a caravan of 30 cars. Your pic of that juniper on the hill reminds me of... something that Harry Hirao once told me: if you can wiggle the tree, don't dig it, cause its main root system is not closeby. Also, very rougly speaking, a 3" trunk diameter = 400 to 450 years. A senior Kofukai member counted rings under a microscope.
Dwight, they do ship across state lines -- these junipers are like weeds to ranchers, they burn, bulldoze, and backhoe 'em to clear land. 2 years min to get anything like this established. There is a commercial guy, I think in Utah (?) -- he's also a forest ranger, really -- he sells freshly dug, and of course with no survival guarantee. I would not recommend him. A 50% survival rate is already considered as good as it gets. You could get one from Roy Nagatoshi, of Fuji Bonsai Nursery, located in Sylmar, California. A sprig will run you a couple hundred bucks

... but I would trade you one for a good Sakai kohak
Dubtaco/Chris, most folks in SoCal use 100% washed agricultural pumice, a small minority use the decomposed granite from around the dig site.
Nanci/Aquatori, my now friend Mapache, who helped me build my pond, is actually from a Home Depot parking lot -- I had him come tree digging once and it was like 'OMG, that guy is a backhoe.'
John