As of the time of this writing (July 13th, 2013), these are the prices of each version of the iPod, from the Apple store in the US:
16GB – US$229
32GB – US$299
64GB – US$399
To check current prices of the US Apple store, please see:
And of course, if you’re living in a country other than USA, you would need to choose your country’s Apple store here:
International Apple Store Directory