$10 to over $100. A halfway decent one should run about $30 or $40. A crap one will be $10.
It depends on the size and material of the knife.
A pocket knife can cost from $0.20-$1.000
Razor blades are much thinner than a knife blade. You can shave with a knife but it leaves much more 'razor burn'. If you attempt to shave with a knife I would recomened a very sharp knife and lots of lotion and band-aides.
It depends on the size or material that the knife is. usually anywhere between a few ounces to maybe a pound.
A lot
A sharp knife cuts much better than a blunt knife. A sharp knife is less likely skid off and cause an accidental wound.
1000000dollars
you can get at least 100 quid
1000$ 1000$
Buck119 x
Check Ebay
10,000,000,000