Any random atom-based netbook with a broken screen (you can use an external monitor on it since you don't care about mobility) is the cheapest thing you're going to find for "cheap little servers" for the house.

However, I run Linux on them - not sure how well windows runs with that low of horsepower.

Keep in mind that if you run bitcoind at all, you might need to spec something higher than the typical Atom netbook - bitcoind uses around 1-1.5GB of RAM these days, and I know my dedicated wallet machine can get sluggish due to that fact.