i just got back from mex last week...u can get them at dana or at the boarder at one of the immigration offices. We did the immagration office route and it was easy, just need your passports and fill out a paper, they stamp it and your on your way. We did not have to pay anything for the visa and it took maybe 5 min. for 4 guys.
We where stopped (inspected) by the federallies, local police, and navy during our trip and they never once asked for the visa, only passports. Also during these encounters all the officials where very quick and courteous. I'm not sure why so many people r freaked out about driving thru baja....IMO things where much more sketchy down there in the late 90's-early 2000 when american tourism was booming.
Wish i could go
