On ministry of media, which was won by Madlen Flint in the first virtual reality show in SL, there are 3 4096 sq.m plots for sale.
The sim has friendly residents, Madlen lives on it and she has an amazing landscaped home. Check out her profile and feel free to explore the park.
The 4096 sq.m plots for sale are 20 000 lindens to buy each with 7500 monthly tier. Buying price includes the 1st month's tier, so actually you buy the land for 12 500, plus 7500 lindens. You can resell the land at anytime.
IM Madlen Flint if you have any questions.