HP MicroServer Cashback Offer Extended (March 2011)
Just in case @kiwi_si hasn't posted about this, it seems that the cashback offer on HP's MicroServer has been extended again until the 31st Macrh 2011.
Even better, ServersPlus have apparently picked up new stock at a lower price that they are passing on. This means that after cashback that you can get one of these little fellas for under £100 (ex VAT) – sorry, UK only.
For further information about these servers, including how well they work in a home lab environment, head over to TechHead.
Or, for that low price, you could just buy one and play with it!