Looking for advice on a present for my brother

My brothers birthday is in a few days and I wanted to get him something for his birthday that was Warhammer related. I know he's pretty into painting minis. He lives in another state so I can't really snoop what he already has which makes it difficult. I'm also a big nerd but know basically nothing about 40k. He's into space marines, tech priests, and orks. That's about the extent of what I know. Appreciate any advice or suggestions!