The geekiest sim around is for sale!!! Asking price is L$ 350000 for the full sim. This is a full 15k prim sim 65536 sq meters, $195 a month tier paid to the lindens (you do need a premium account to buy this land).
Android is a gray mountain top in the clouds, best suited to skyboxes IMO, but with a nice geeky name like that, perhaps it will appeal to a Trekkie or someone who will want to build in the stratosphere anyways http://slurl.com/secondlife/Android/96/128/159
Reasonable counter offers will be considered.
Rental is an option for an established player, but would require a single monthly (not weekly) payment in Paypal of $250 per month.
There are only a few mainland sims for sale on the market, LL has not been selling them for a while. Unlike buying used islands, you own the sim as soon as you pay for it, no waiting in queues, no extra fees, you buy it and its yours!