Since @Macky mentioned my list of the South Walians among Beca’s interviews, here’s some:
13, 19, 20, 24, 31
(these are the ones I found in an old post right away, might have missed a few but I guess that’s a start).
Bu the way I also agree with the suggestion of practicing the North Walian as well, at some point but in the beginning I found these a bit easier!
p.s. as for audiobooks have a look at Colin Jones’s:
South Walian accent and vocabulary!