I buy most of my 9mm at Dunham's. The price changes almost daily so you have to watch it, but the Blazer Brass is usually $9.99 and often on sale for less. I've gotten it 2 boxes for $17 and one time it was 2 boxes for $16. Locally it will be advertised as your choice of 115 gr or 124 gr but sometimes they only have one or the other in stock and no rainchecks.

I also bought 3 boxes of that Federal you mention just before Christmas for $42 each which is a good price IMO.

Online prices usually aren't much cheaper and the shipping will kill you unless you buy 1k rounds from someone who offers "free" shipping. Even then the price difference is so small it's easier for me to just go to the local Dunham's and pick up what I want.