Over $50. Well built and fully functional knives are in abundance below this level. Hand tools of all types sit at that level with excellent quality. Above that is expensive for a very simple tool.
Last knife I bought was a little north of $700. Also tracking my purchases with a spreadsheet, average price over the last year is currently $153. I buy expensive knives because I have a passion for them, not because I need to spend $150 to cut some rope or cardboard.
"When the thunderclap comes, there is no time to cover the ears"