RioBravo will be there and he has some Hog's:
http://www.riobravoreptiles.com/

Good way to save on shipping!

These may help explain the differences:

http://www.boa-constrictors.com/com/com.html
http://www.redtailboas.com/morphs/morphs.html
http://www.nafcon.dircon.co.uk/boaconstrictor.htm

Sand boas and rosy boas are awesome as well!