I have a 3616sqm plot in the Polkadot sim (174,13) that has 829 prims.
The rent is pretty cheap (please DO compare)
Its 5785L/month : thats the same as 1335/week.
If you want to stay long-term there is a discount. Pay for 11 month and you get to rent it for a whole year.
The land is situated on both sides of a linden road near the sim edge.