Sandblasting supplies?

[jfiscus]

I have a sandblaster for my air compressor. Last summer I put the wrong (playground sand) in it & I haven't went to get the correct media for it yet cause I haven't needed it yet. I have a coupel questions about it now that I might be using it soon.

The tip on my gun looks to be ceramic & has chips in it (from dropping it I guess). Where can you buy these tips around here?

Where can you buy media (besides tractor supply)?

What is the best way to "collect" this media while you're spraying?
I have to blast a large hood soon & was thinking a tarp might work?