Hyde,
The difference between the BA and the BN is in the close focusing distance of the binocular..and nothing else to my knowledge. The BA was the original version of this model and had a close focusing distance around 12-13 feet IIRC. The BN version was created around '98, '99 again IIRC and allows for a close focus around 7-8 feet. I have the 7x42 BN model and find it is, arguably, the best binocular I have owned in many aspects. At this price, and considering your are using them for hunting, I would jump at the opportunity.
Heck, maybe I will too.

You might want to check on where Cambridgeworld is though. For some reason I am thinking the United Kingdom but I may be way off base with that one.
Thanks for the link.