The average adult BP will be ok in a 3 X 2 pvc enclosure that is anywhere from 12-18 inches tall.
Here are all of the manufacturers that I know of:
http://www.boamaster.com/
http://www.boaphileplastics.com/cages.html
http://www.animalplastics.com/
http://www.repti-racks.com/index.php...&id=1&Itemid=1
http://www.pvccages.com/new/?page_id...&product_id=49
http://www.constrictorsnw.com/cagess...ssiccages.html
http://www.visionproducts.us/htm7/cages.html
http://npicages.com/index.html
http://www.showcasecages.com/
http://www.cagesbydesign.com/t-majesticreptile.aspx
http://www.sentecreptilecages.com/
http://powerhousedisplays.weebly.com/
http://monster-cages.com/custom-gallery.php
http://www.jworlds.net/units.html
http://www.lstplastics.com/
Hope this helps...