Intel doesn't really drop their prices. Prior to the release of the i5-3570k the i5-2500k was selling for $225 on Newegg (excluding any sale). On the release of Ivy Bridge CPUs the i5-2500k has dropped to $220 where it remains today.
The i5-3570k normally sells for $230 on Newegg. After the release of Haswell it will probably drop to $225. Newegg currently has a $15 off promo code so you can buy it for $215.
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116504
You are unlikely to find it for a better unless you live near MicroCentre and wait until they have a sale on it. They sometimes sell the CPU at or below cost (like $185) to attract people into the store so that they will spend money on other things. It is an in-store sale only so if you can't get to a store then... too bad...