Reply to Acoustic treatment advice needed.

I have recently just leased out a place for a production studio, i will be in the building with a friend who produces also but this is my first time treating a room.

Now my friend has fully treated his room and has Nelski (Rising Music) coming up this weekend to make sure everything is the way it should be but my room isn't ready.

I'm planning on buying acoustic foam to place on the walls/roof and bass traps in the corners etc and also planning on buying some sort or rock wool to cover other parts.

So my question is, do you guys know of any places that have good prices for acoustic foam and what i would be looking to purchase? Remembering i'm in the UK and shipping from US can be expensive.

Also do you guys have any tips?