Guitar is in concert A and the tenor saxophone is in Bb, so to transpose music from guitar to tenor saxophone you move up three semitones (A, B, Bb)

That depends on the guitar! On a Tenor guitar there are four strings, on a standard guitar there are six strings, and there are twelve strings on a twelve string guitar.

Tenor guitars are hard to find in a regular music store. A tenor guitar can be bought at Mandelin Brothers located at Staten Island, New York, Gruhn Guitars located at Nashville, Tennessee, Elderly Instruments located at Lansing, Michigan, Rothman's Guitars located at Southeld, New York, Players Vintage Instruments located at Iverness, California and Bernunzio located at Rochester, New York. The other alternative is to have someone build the tenor guitar.

Priaulx Rainier has written:

'Dance of the rain, for tenor or soprano and guitar' -- subject(s): Songs (High voice) with guitar

The recorder surely the mighty GUITAR?

Theres also the countertenor, the tenor, the bullroarer.