ar15man,
I forgot about Newt! If you really do want an inexpensive straight knife I'm sure Newt would gladly sell you one of his neckers for under $50, Little Pecker, WOO and NRGS all come to mind.
You will get a fine chunk of 1095 (that will need some bevel work), a bit of para cord on the handle area (which you will want to improve upon), a .6" kydex sheath (that you will not feel bad about drilling, cutting or altering in any way) and about 3' of cord to hang it.
The steel will only be parkerized, but the heat treat will be good, it will be hard but fairly easy to sharpen. 1095 is not a stainlees steel but it does takes a hellish edge (oil is cheap!).
So there you have it - your perfect, inexpensive, back-up knife, all you need is $25-$50 and a few hours to get it where/how you want it.
While Newts smaller knives can't be said to be pretty, with a little work they can be very practical. My other suggestion would be to check your local gun shows for local makers, I have seen some nice small knives at a relatively low price in my area...and makers willing to work with you.
Good luck!
Steve-O