Lets see... 9 30 round mags is $90, plus a total of 360 rounds of ammo thats $40, plus a $100 Chink drum, plus $10 for the two lo cap mags, plus $5 for the mag pouch...
The total comes to $245... so assuming you bought everything separately at minimum price, you still saved $5. So Id say you did pretty darn good.
PS- so people don't try to kill me, the 30 round mags are $9.97 at SPG and the local gun shop has a Chinese drum for $100. So no I am not making up the prices.