Black Friday and around the holidays is the best time to find sales. If you're patient, and can wait, a lot of times manufacturers blow out old inventory when a new series of the components come out.
Another great tool to use is camelcamelcamel. It tracks pricing on Amazon, and you can set custom alerts when pricing reaches your desired levels. It also shows a history of pricing for the item, and can tell you when it was at it's lowest/highest. There's even a chrome plugin that makes it even easier to use.