Richard Powers - and audio books

I found this group by searching on Richard Powers - my favorite author. I have a blind friend with whom I would love to share some of Powers' books - especially Gold Bug Variations and Operation Wandering Soul. So I'm casting a wide net to see if anyone is aware of such items existing. The only work from Powers I have found thus far in audio format is "The Echo Maker", and I don't consider it the best starting place for his works.

I have an electronic text version of Gold Bug Variations that could be run through a text-to-speech app, but those are not as satisfying as an actual reader.