Where do you get SIC grit finer than 500?

[LJS]

I have up to 320 but want to order some finer lapping powder. Gotgrit.com tops out at 500 for SIC.

Where are you all sourcing SIC grit finer than 500 please? I see mention of 600, 800, etc but not sure where to buy (would like to order several mesh sizes).

 

[GeronimoWSB]

Amazon has it, gritomatic has a 9 grit pack for like 45 bucks. from 60 to 2000

 

[Chan Eil Whiskers]

Link. But you don't need this much.