US $8.50 for a 20,000-prim region on the hypergrid-enabled GeVolution grid, with a 14-day free trial.
Grid offers Vivox voice and the local GV$ currency, and supports variable-sized regions.
A residential starter region with 7,500 prims is $5 per month.
Variable sized regions:

4-region varregion with 50,000 prims: $18.50 per month
16-region varregion with 100,000 prims: $38.50 per month
32-region varregion with 150,000 prims: $58.50 per month
64-region varregion with 200,000 prims: $78.50 per month

For full details, see the grid’s Region Purchase page.

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