Hello thanks for writing to us.
We would like to invite you to try out our upper intermediate and advanced current affairs lessons. They are all mandarin speaking only. The dialogues are downloadable and you are set in auto reply mode to keep listening to it. The current affairs “dialogues” are news article read aloud. Please give them a try!
As for the question of accent, the Beijing accent is truly different from Taiwanese accent. But for listening practice, you may want to be exposed to various accents to stretch the range of sounds and tones and abbreviations used by speakers from different regions.
I am not particularly aware of a Taiwanese source on read aloud alone. But I will look into it and if something turns up, I will get back to you.