In recent years there have been quite a few classical guitar transcriptions of the tangos of Astor Piazzolla (the Argentinian tango king). Sheet music is available for quite a few (if you read) and some of these have been recorded, but I can't think of any devoted solely to tangos though.

Some of the gypsy guitarists of the 30s playing with the musette accordianists probably also have tangos in amongst the waltes, but again you'd have to hunt for them.

I should try the Argentinian section of a good world music record department.

Mick