
Rudy,
These are all good questions. And, they have good answers that you should have no trouble finding in a simple search of this forum as they have all been asked and answered numerous times before. You might even search another forum that many here use (some words in the name of that forum are com, user, and bmc in some combination).
I'll sum up the answers as I've learned them from reading through this forum myself. I encourage you to get the details by doing the same.
1. No.
2. Inexpesive external power supply available from third party vendors. See your favorite retailer's website. My personal favorite is made by ikan, but I have not used it (since I don't have a BMCC, yet).
3. The most affordable support system is none. You don't technically need one. The most affordable depends on its use. Without knowing what use you intend, it is doubtful that the replies will be very helpful.