I host 10th prestige lobbies on COD4/MW2 about 3 or 4 times a week, if you want in...they cost 1600 Microsoft Points.
Details: One person pays, and they can get however many people they want to in one lobby. The lobbies generally include (unless specially requested): 10th Prestige for everyone in the game, all challenges completed (all titles and emblems on MW2), one-day infections, colored custom classes, golden secondaries, all weapons/attachments/camos, custom leaderboard stats.
Optional (Extra-Cost): Lifetime Infections (4000 Microsoft Points, includes lobby, but you will keep any infections you want for the rest of your playing days...unless you want me to take them off at a certain time) 6-months Infections: 1600 Microsoft Points ASIDE from the 1600 for the lobby.