AllATPs has a deal called MIFR10 that gets you a multiengine commercial instrument in 9 hours plus an hour for the checkride. $3000. If you feel you are not all that strong they also have a MIFR15. I did the 10 hour package, I went in well prepared by working through the King "Cleared for Multiengines" dvd set beforehand ($200). The above post mentions SOP. AllATPs will send you the data you need for the Seminoles they operate. And skip the Jepp book. Get the FAA "Airplane Flying Handbook" as a reference, FAA-H-8083-3A ($20).

The real problem is finding a twin to fly afterwards! Very few are out there for rent these days and they want you to be Bob Hoover to qualify for insurance. A lot of people end up buying time blocks at Aviator and Skymates out of sheer desperation. Good luck!