Avalon

US $8 for a 20,000-prim region on the hypergrid-enabled Avalon Grid. Variable-sized regions also available.
Two-by-two varregion with 40,000 prims: $18
Three-by-three varregion with 60,000 prims: $30
Four-by-four varregion with 100,000 prims: $48
Add-on prims also available.
More info here.

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