I have now bought Seasons 3 and 4 of Stargate: SG-1 off eBay. #4 I sniped at the last possible minute -- it was totally by accident, I swear. But now I'm impatiently waiting for them to arrive because I WANT IT NOWWWWWW.
In other news, by which I mean I'm still playing SpaceChem: I've finally figured out how to avoid the problem of pipeline stalls. You have to forward all the molecules needed for a product through every intermediate reactor they arrive in, never waiting for molecules of a particular type, and only pause to assemble them in the very last one. That way, you never get the situation where the final reactor has all of Product B it can hold and is waiting for Product A, but the intermediate reactor is stalled because the pipeline where it was pushing out B is full and it can't move on to look for newly arriving A. Alternatively, if there's a recycler in the level you can just have the intermediate reactor throw away incoming atoms it doesn't want just at the moment so that the final reactor is guaranteed to receive what it needs in the order it needs it, but that does lead to a slower solution.