CFI deals
FlightSafety in Vero, 1-800-800-1411,
www.flightsafetyacademy.com/, is known primarily for its 141 program but also does a lot of Part 61 training. They'll work out a package for you. I instructed at FSI several years ago. I trained CFIs and single-engine commercial students as well as Part 141 multis, and can vouch for the quality of training. Of course, it's pricey, but the facilities and equipment are first-rate and the place does try to serve the customer. I'd say that depending on how current you are you can finish both ratings in a month at FSI.
Sheble Aviation is in Nevada,
http://shebleaviation.com/. In many ways this place is the antithesis of FlightSafety. For every way that FlightSafety is the formal, gold-plated school, Sheble is not. It really is a family-run business as FlightSafety is corporate. I did my ATP at Sheble nearly thirteen years ago when the place was in Blythe, California. The place will get the job done, and get it done fast. I looked at the Commercial single course syllabus and while it finishes you in two days you have to meet quite a few prerequisites before you can enroll.
Hope these two ideas give you a start. Good luck with your training.