Well, it wasn't a great deal and I don't know what a "JM27" is? Your 3 SM57s are about $85 each new. 3 cables, maybe $30? 4 microphone drum mounts, maybe $40? 1 pop filter, $25. One boom stand, $35. That's for new stuff. You do the math.

My math sucks
Ms. Remy Ann David

3 SM57's X $85 = $255
2 JM27 (SDC) X $50ish = $100

I guess I answered my own question. That alone right there is Roughly $355

it's close, i wouldn't go out of my way to grab that unless i need those exact mics... but if that's what you wanted, good thing you grabbed it. the cables, clips, and pop filters, depending on the quality, make up the difference between the price minus the mics' price. you probably saved a few bucks.