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Can anyone tell me where I find supplements to Space Marine Codex.

I see a lot of lists with Skyhammer Force or Flameblade Force etc and don't know rules for them

You need the book Angels of Death, which has new rules for almost everything in the Space Marine codex.

It's the only really needed, because stuff in the other 3 supplements were rolled into it.

There's also the White Dwarf Formations which aren't hugely popular, some occasional lone Dataslates like my own Tyrannic War Veterans Formation and the 'buy a box' Formations like the HQ Command Tanks or the Start Collecting Formation. But Angels of Death has the vast majority of the options available and is likely the only one you need. It'll be rare to see something outside of that book these days.