some lawnmower blades are very cheap , others are very hard steel. if yorue just getting into this , i would stick to leaf springs. they are almost all hard steel.
old files work great without much forge work , and ive made some from old combo wrenches that were actually tool steel , not chrome vanadium. im not really a metal smith , but i do mess with a little forgery here and there.
if youre short on cash for a forge , you can make a lakota fire and do it that way.theres also cheap ways to do it , popular mechanics just had an article last year on making a forge out of a steel wash sink and a leafblower if i remember correctly...
khalv : im surprised to hear you quench in water. i dont know anyone who does that , does it work better than oil quench?
you can also buy blanks , thats what i did for a long time. not the cheapest , but it saves you from building a forge...