Why are only the first 3 seasons available on DVD? Where can I purchase these for a reasonable price?

I can't answer why we only have Seasons 1-3 of CI in the USA (or why NBC Universal Home Video released them in 1, 3, 2 order and not in the right numerical sequence...that so ticked me off that I stopped watching new CI eps on NBC until they released Season 2 which put me like 2+ years behind and so I had some serious catching up to do and thank goodness for Bravo and USA...but I should get back on point)

For new DVDs I like deepdiscountdvd.com (usually they are the cheapest and I think they still do free shipping). For used DVDs you can try all the usual suspects: Amazon, half.com, ebay. For DVD rentals I prefer Greencine to Netflix or Blockbuster but that's because I like watching obscure indies.

Oh and I think you can get all the CI DVDs from the USA CI store too

The Vault

nod to that. keep an eye out at target cuz sometimes they sell boxsets for $20

Though probably not the most budget-wise choice, I've also seen them on the shelves at Borders Books and Barnes & Noble in Sacramento, (In addition to the first 3 full seasons, the First Episode of the First Season is available as a single. Since it is also on the First Season Box Set, you might want to be alert, if someone tries to sell you something that sounds too much cheaper than the apparent market price.

In addition, if this interests you, I noticed yesterday (Oct 13), that Amazon.com is now advertising all Season 5, 6, and 7 Episodes (after first airing, of course) for download. As far as I know, Seasons 5, 6, and 7 are not available on DVD or VHS Tape; and, I can't figure out what happened to Season 4; but, I took advantage of the Season 6 Marathon to Tape every episode I could; they are a little out of sequence; but all there.

I would hope, if they aren't going to release Seasons 4 and 5 on DVD soon; USA will run Season Specific Marathons on a couple of weekends, to allow "the obsessed" to make those episodes part of their collections. (Note, for most working people, Thursday daytime Marathons don't work well for recording; as one can't get tapes that will record 10-12 hours on a single tape. Also, if I tape while watching, I pause through the commercials, which shortens the time of each episode and allows more episodes to fit on each tape.)

Update: Seasons 5,6,& 7 are available for download on Amazon.com

Season 4 has not been released in any form (except instant viewing in netflix), correct?