@elizabeth
I was looking at that stuff a few weeks back thinking of buying some as a present for one of my brothers for Christmas (before this discussion of the VERY affordable DIY configuration, ofcourse). I enjoy upgrading his stereo every year, and watch his amazement that I could improve his audio or visual with VooDoo. He's not an audiophile, but does love his a/v, and is an Electrical Engineer specialized in Satellite Communications and guidance systems...so not only do I love improving the sound he and his wife hear, year after year, but I love watching the thrill on his face when we boot it up, and he plays in front of me after a new upgrade. Showing him there is more to know than electrical measurements when it comes to final audio output is fun for me, as well. While I very much enjoy bumping into engineers out here that are audiophiles and delve into the math of it all in a way that enhances my knowledge, it never ceases to amaze me how little a premiere rocket scientist can know about what we hear.
With that, in case you ever run out again...check out the GSA website...they auction everything government surplus, used or new, to include electronics, wire, cars, boats, houses, etc. Yeah,,,all of that.. You'd be amazed what the government sells for pennies on the dollar.