What is your favorite, and where did you get it?  Price?
M9? Chi-com M9 copy?  One of those Saw backs or bowie blades from SarCo?  

I need (read want) one for my new (to me) pre ban.  

I have a Lan-Cay and a Chicom, the Chinese copy is of surprisingly good quality, but the Lan-Cay is sharper out of the box, didn't come with a pistol mag pouch as the chicom copy did.  Got the real M9 from www.cheaperthandirt.com for about $100. Here's the shameless plug: let me know if you wanna buy my chicom copy, I have more bayos than ARs
Here are some pics of the M9 Lan-Cay and the chicom copy:

A few months ago I purchased one of the real M9's from Cheaper Than Dirt and nearly got it for $10!  The kid at the register did not know what it was and started thumbing through the catalog and he thought it was the $9.95 knife.  I thought I misunderstood him until he rang it up, I then proceeded to tell him to try again  that it was more like $99.95!    (I do alot of business with these people and I do not intend to screw them, they are good people)