AviWorlds

US$10 a month for a 15,000-prim region on the AviWorlds grid, no setup fee. Hypergrid, Vivox, Kitely Market, varregions available, local AV currency.

Other region sizes also available, from $25 a month for a 50,000-prim two-by-two varregion, for $100 a month for an eight-by-eight varregion with up to 500,000 prims.

Land rental page here.