Franz Oberhauser (Christoph Waltz) wears a pair of Prada PR03RS sunglasses in SPECTRE.
The glasses are worn by Oberhauser during the funeral scene in Rome. The glasses have a black frame, grey gradient lenses, color code 1AB0A7, and a metal line with Prada logo along the temples.
These black sunglasses are still easy to find, for example online at FramesDirect ($240 / £158 / €219), Amazon.com ($193), SmartBuyGlasses USA ($189), SmartBuyGlasses UK (£133), or Amazon.co.uk (£112).
Oberhauser also wears a pair of Prada shoes at the final scene of the movie.
The metal logo line on the temples of these Prada sunglasses looks very similar to the signature Tom Ford line. James Bond himself wears two pair of Tom Ford sunglasses in SPECTRE, the Tom Ford Henry and the Tom Ford Snowdon.
Thanks to Lorenzo Anselmo for the ID