Hogg Island is the way to go.
Mabe pay more,but they top out at 6 feet with some girth.
They are very pretty animals,onley downfall is some do have the dwarf attitude.
But with time and handling they over come it quickly.
Not to mention they can change there pigment.
They can go from dark to light in a matter of minutes,which is pretty cool for a boa species.
Just a suggestion.
if not,just go all the way and get yourself a Columbian Boa.
They are not what you think and are great animals that yes can get big,but do have great personnalitys on them.
Especially if you grow them up as babies.
Obviously do your research before making your mind up.
Here are some great sites to check out.
http://www.bigappleherp.com/site/con..._Tail_Boa.html
http://www.redtailboas.com/general_c...eral_care.html
http://www.redtailboas.com/forum/arc....php/f-14.html