For Black Friday weekend 2018, Big Finish has constructed a sale based on the idea of Fantastic Foes, with new titles added each day. They include plenty of Davros and Master, including some recently titles. Full details: FANTASTIC FOES WEEKEND OFFERS.
Today (Saturday) is all about the Master, and I can’t decide which to recommend. There’s Derek Jacobi as the War Master but also Mark Gatiss as the Unbound Master against David Warner’s wonderful Unbound Doctor. Whichever you get, there’s plenty to enjoy!