We're in the last hours of the "landrush period" for .mobi domain names, a period when .mobi domains are available to the general public for a higher-than-normal price; in exchange for paying mor eper domain, you get a better chance of getting the domains you want. Starting tomorrow, October 11th at 10:00 a.m. Eastern (7:00 a.m. Pacific / 1400 hours UTC), the .mobi Registry will drop the price of .mobi names to their standard price.
For more on /mobi, see MidwestBusiness.com's article, Thursday Begins General Ongoing Registration For .mobi Domains and ComputerWorld's article, Why you need to buy a .mobi domain name soon.