What is your MOBO? Do you have the money to upgrade that as well? If so I'd suggest going to a am3+ and a 6300 (or 8350). You will get some life out of the am2+ still, but you'll get more life if you upgrade. Especially if AMD starts moving all the CPUs toward AM3. Plus you could upgrade to Steamy.
my motherboard is a 780G and I don't really wanna upgrade the motherboard right now if I don't have to. I am just looking for a higher speed quad core processor. I was thinking around a 3.0 or close to it if possible. Just wasn't sure if I could put a am3 processor into my desktop or not?
With your current Motherboard.. no. I highly doubt it. I suggest upgrading the motherboard. If you have to wait to do that and the CPU then you have to wait, but you won't be able to really do either with out the other and get much out of it.
As for finding one, good luck. As far as newegg is concerned, AM2+ does not exist. So if you were planning on buying a CPU there, you'll have to find a new site. But again, go for the motherboard and the CPU.