I don't know if it has been mentioned before but the Spyderco Bow River is a full flat thin blade knife... that is also cheap (compared with all the other suggestions here). I bought one when I first found about it and it was certainly cheaper than they are now, but they are still a lot less money.
I am more a Kydex than Leather sheath guy but... the stock leather sheath works just fine.
Mikel
I am more a Kydex than Leather sheath guy but... the stock leather sheath works just fine.
Mikel