Do you want a "survival" knife or a knife for "survival".
1: You can get any black knife with serrations and a compass in the handle and matches and stuff for something like 10 bucks.
2: You can get a knife that is not too big and will be with/on you if the byproducts hit the air transportation thing. A Fallkniven F1 or S1 is more than 50 bucks, an F1 is about 70-90 depending on configuration. They are 4"-5" and dont have any of those combat attires people sometimes think is a must on a "survival knife". The F1 was designed for Swedish Airforce use and the S1 designed as a "forest knife".
As an anecdote the swedish airforce evaluated the SRK for a new survival knive back in 1990 something but eventually put the contract out to Fallkniven, the result being the F1. It is not a knife that will impress Indiana Jones or Crocodile Dundee but if you end up in the nowhere and the F1 helps you back to the populated areas you will be happy anyway. By the way, the Fallkniven knives are great to get sparks from a firesteel as well, the blade back is sharp like an iceskate.
Remember that a "survival knife" doesnt mean that it is the knife that helps you "survive". Your fancy 8" super-Rambo-CIA-SWAT-stealth-ninja 50 piece "survival system" is floating down river into the next time zone because it was strapped to your backpack and you have to make do with your 4" in your pocket. What did we learn from that? The 8" was too heavy to carry on your belt so it ended up on your pack, so why bring it at all. The 4" was the knife that "saved" you so better make it a good one.
Rumours say that the Fallkniven WM1 is popular with swedish special forces. They wear it in a neck sheath inside all their clothes with a fire steel. If everything else is lost they will at least get a fire running and get warm.
One other thing I read somewhere. When you find a knife you really like, get a second one. When out camping wear one in your belt and keep one in your pack. If for any reason loose one, you will have a spare so you dont end up using your multitool knife from day three on a two week trip

Pack that spare knife in a water tight container with fire making things and such. If everything else is wet it is important to get warm again.