When most people think of "normal", I believe they are referring to the BCI. As mentioned, those are the most common pet store snakes. BCCs are more expensive and tend to have more demanding husbandry needs. Suri's (BCC) are my favorite, but I can't afford one at this time, nor do I have the means currently to fulfill the husbandry needs to their fullest.

Most of the morphs are typically seen in BCIs.