I know it isn't a good time to buy an Anton Yelchin auto - I actually have one from the 2009 Star Trek movie, but love this picture:
Having said that, the picture also made me a bit suspicious, considering his death was before the movie premiered (the promo images came out before his death, but a lot of the other cast autos I've seen on these prints were acquired at the various premieres). (I also hadn't seen his signature with a full stop after the A).
Toppixautographs has some for sale from him.
Link is: http://www.toppixautographs.com/
Here is one direct link:
There are a few up there.
Thanks - that is a great price as well. Funnily enough though the direct link is the same picture I have. I just really like the promotional shots from Star Trek Beyond, but am very suspicious of anything from Beyond that has Anton's signature on it.