Rent a small two-storey house for just 10L$ per day. You pay a rental box from 1 to 150 days. As long as you remain in continuous payment, the price is guaranteed until LL raise island maintenance fees. For more details see Picks in Mercia McMahon's Profile.
The houses are on Urbana Spes, a mature region-wide city with extensive tunnels, freebie shops, sky-diving, and a dance club. This is a Class 5 server region. The covenant is fairly simple, amounting largely to pointing out some Linden Lab policies (e.g., on adult content).