The mistake I often see people make when they are first starting out and they mention BCI they ONLY think of Colombian imperator.

One great thing about the BCI subspecies, they range from Mexico down through Central America and into Colombia. Not to mention numerous insular locales.

When dealing with ANY BCI outside of Colombia you DO NOT have to worry about a boa that will reach anywhere near 10ft. In fact I'd say the largest you are going to encounter out of a HUGE female outside of Colombia is 7ft.

The BIG Colombians are not as common today as they once where. Recent bloodlines and breeding for smaller sizes has resulted in smaller boas. For example, a lot of captive "Colombians" were at one point bred into Hypos or Salmons, both of which have origins in Panama and other Central American locales.
Big Colombian females reach about 8ft. now, and big males 7ft. Both of these sizes usually come from significant feeding and extreme age.

A male that is fed well of ANY BCI locale, fed to be a healthy, strong and breedable male, would be around 3-4.5 ft. Keep in mind Males are a lot slimmer build than females as well.

Here are some available BCI locales, and expected sizes for males/females. One consideration I would make (I don't know what quality of show you are going to), use the show to get a feel for boas, but buy from a breeder that you know has quality animals and specializes in Boas.
(Format, Male/Female size)
Mexican (Sonoran, Cancun): 3.5/5 ft.
Tarahumara Mt. (Mexico):3/4 ft.
Nicaraguan: 4/6 ft.
Hog Island: 4/ 6ft.
Honduran: 4/6 ft.
Cay Caulker: 3/4 ft.
Crawl Cay: 3/4 ft.
Costa Rican: 5/6.5 ft.
Panamanian: 4.5/5.5 ft.
Colombian: 6/7.5 ft.

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