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I was down at Dave's on Tuesday asking the same thing.
Some young kid who works there said that Aimpoint themselves are making a riser. Estimate 3-4 months.
+1, IIRC TSE's price list has aimpoint risers on their.
If you are looking for a QR mount, im not sure if they are available here yet, but ADM makes one for AR15's, in both absolute and lower 3rd co-witness (different spacer)
I know ADM products are available here, so SOCOM Supply may be able to get them (they are an importer for them)