Is there any difference between these two knives? I am looking to get a BK 2 and a BK 7 and I am kinda confused. I have found this site http://www.google.com/url?sa=t&rct=...eMldmfjKAUcYp-S4w&sig2=APccAl7IoJQLF5MfT7qX1Q which shows the knife for sale for $62.97 but when I see the same knife for sale in the "for sale section" it seems to be going for a lot more? The only difference I can see between the above knife and the ones I see for sale are the color of the sheaths? Please help! I am very confused.