What motor is this for?

If you're running normally aspirated, all motor, whatever you want to call it, forged pistons aren't really necessary. Assuming this is a GSR you're talking about, you can get a 12:1 compression ratio with CTR pistons. The stock rods are pretty much fine as well unless you plan on revving way past the stock redline, but it's not a bad idea to upgrade them if you are.

As for deals, I don't know anything "amazing" offhand but you can get a set of Eagles for $329 from importparts.com here.