The 2004 Anti Venom set went through a few iterations. First, there was a dark blue version of the set. Then, a lighter blue set appeared. Finally, we got the tan version at retail. The retail figures are held in high regard and tend to fetch decent prices today. I was never a fan of the dark blue figures: mostly because the blue was too Cobra. The light blue set, though, was better since the color kind of work for law enforcement type figures like Mutt and Barricade. For Roadblock, though, the light blue pants are out of place and the production figure is substantially better.
In the mid 2000's, you could buy these figures on Ebay, on a website, or just by emailing the seller. Depending on what the most recent Ebay auctions ended at, you could get these figures anywhere from $10 to $20. The light blue Anti Venom unproduced figures were among the more common sets and you could get Duke and Charbroil for 1/2 the price of this Roadblock. Obviously, this isn't the case today and this figure will fetch a substantial premium. But, there are a lot of them out...probably almost as many as the convention set character figures. You just don't see them as often as you used to.
Below is a photo of the retail Anti Venom Roadblock, the unproduced light blue version and the production HAS figure which used the same paint masks as the Anti Venom set, but changed the plastic color on the pants. You'll notice that in addition to the light blue pants, the unproduced Roadblock also has a slightly darker shirt. Other than that, the figures are very much the same. Personally, I think the HAS figure is the best use of this mold with the Anti Venom production figure being second. But, the unproduced figure gives collectors something more to seek out.