US $9 per month for a 25,000-prim region on the hypergrid-enabled GreekLife grid.
Other region options are also available.
A 10,000-prim reion is $4 a month.
A 30,000-prim region is $18 a month.
The grid also offers varregions.
A two-by-two 60,000-prim varregion is $18 per month, and a four-by-four 1100,000 prim varegion is $37 per month.
OAR region file uploads and downloads are $5 each, and IAR inventory file uploads and downloads are $3 each.
More details here and here.