Officially cancelled at the end of its third season I'm betting this show might resurface. Each season has gotten better and more dangerous than the last and while this is still the sort of silly twonky nonsense the BBC has always been known for dishing out it has the the sense of humor and imaginative soul that have made British fantasy and sci fi a staple stateside for many. You get all ten episodes of Season 3 plus a twenty minute intro for the uninitiated. or those who don't know Primeval follows a group investigating time space anomalies that create portals thrugh which dinosaurs have an unfortunate habit of popping through. Lots of CGI mingles with fairly unpredictable character arcs (especially in this season) for a solidly entertaining mix. You also get a featurette.
I'd say that you're a bit late, given that it's been renewed for two more seasons a few weeks ago ;)
Let's hope things get a bit better, this show got progressively worse and incoherent. They completely dropped certain storylines in favor of a dinosaur of the week type of setup. They tried to reverse it in season 3, but it was too little too late.
Is the renewal with the original cast, or more of a spin off?