One of the things about unprocessed brass is you don't know what condition it's in. A crimped 5.56 that was shot thru a SAW (loose chamber) will need full length resizing, significant trimming, primer pocket de-crimping. You will spend that extra $6.00 on your time alone very quickly.
Even with a Dillon 650 and a trimmer I don't like to do it unless I have to. I.e. Free brass.