transcriptions of standards?

Two places to start.

 

Try Jamey Aebersold's jazzbooks.com site. I think there's transcriptions of Rufus and John Goldsby, maybe others, and check out Mike Downes book; it has 12 transcriptions of Rhythm Changes bass lines and I think 12 blues too.

 

But after you studied things on paper the best way is to try the transcriptions yourself.

There are so many aids for that now like slower playing without pitch differences.
If it is hard to do try to notate the rhythm first and then do the pitches. That needs time but is worth doing.

I'm feeling the written stuff is too much educationally inspired (even during playing the music) to be real.
On the other hand some transcriptions might be closely related to an instrument like the transcriptions at the end of Oscar Stagnaros Latin Bass Book (which is about Cuban-based music, not Brazilian) which were played on a bass guitar and don't work identically on a double bass (but with some reductions they might do).

 

What are you going to be using this for?

 

The problem with using transcriptions of a specific performance is that everybody else in the band is going to have to play that specific arrangement which, if the band is just calling standards to play head arrangements, isn't gonna happen. It's only going to get him/her so far, so I hope they're doing some other work too...