I want to buy Stargate SG1 series on DVD. I've got the R1 boxed set of season 1, and I'm trying to decide whether to wait and hope the other seasons come out as boxed sets or start buying the individual expensive R2 DVDs that you can get already. Are DVDs like books, that stop being published once demand has dropped? Is there a risk that, if I wait, the individuals may not be available any more and the boxed sets never appear? This series doesn't seem to be as popular as it deserves to be, especially in the US, so I'm not confident about it always being around. Anyone got any inside dope?