The best way to accomplish cutting the small round stuff is indeed the cutoff wheel. They are just a bit thicker than a dime and will cut nearly anything steel and will cut stainless, also.
An easier solution is to load the pieces of rebar in the car, and drive to Home Depot/ Lowes. Put the rebar in a shopping basket, have it marked as yours on the way in. Go to the isle that sells chain, order 6" of the cheapest chain that needs to be cut with their handy dandy cutter (you can't use it yourself) When they cut your chain, say " I need this rebar cut for some garden stakes " a big smile helps here, or send the wife/ girlfriend. Chop, chop, snip, snip. There you go...