Welcome to the forum Grog. You'll be glad you joined.
The value of your knife depends on a number of factors. Up front I will say that I am not at this time a member of NRA. Probably (assuming you are not the original owner) a member will have an advantage in getting you some answers as to how much the knife sold for and what it took to get one. You may already know more than I have found.
The most obvious factors will be condition of the knife and how much of the entire original package you have. As a collectible package, knife,stand, with supporting paperwork, the group value is much greater than just the knife by itself.
I have found no mention of price and as far as I can tell there has not, so far, been one in an auction or up for sale otherwise. It appears that most, if not all, were auctioned at Friends of NRA fundraising events across the country. That makes it even more difficult to pin down a value.
I won't be surprised to find out that none of these 1100 knives were sold to the general public. There are just too many NRA members who would deserve one as a gift for their service.
If you place it on eBay let us know. It will be interesting to see how high it will go for. Of course you will set your minimum sale price. If it doesn't sell. Re-list it again.
Maybe this info will be of some help to others to get you an answer. I will keep my eyes open too.
NRA Knife of the Year 2006
The popular knife and sculpture series from 2005 is followed by an all-American classic. The W.R. Case & Sons Cutlery Company has been handcrafting knives since 1889, and Friends of NRA is proud to include a custom Kodiak Hunter Model as the featured 2006 Knife of the Year. This 11 ounce knife with genuine buffalo horn handle and mirror-polished 6" fixed blade has custom designed grooves and brass guard/butt cap. This limited edition collection of 1,100 knives also includes a two-color black and gold tech print of the NRA seal and "2006 Friends of NRA Knife of the Year" on the blade. Each knife will display a tang stamped number from the factory in this consecutive series.
The accompanying Bison Sculpture was hand-selected and sculpted by Big Sky Carvers. It depicts a bison roaming the western plains resin cast with a custom-fit cutout to showcase the knife below its massive stance. Includes a gold stamp-embossed Friends of NRA patriot on a black felt bottom.
Note: Both available only as a pair.