Viper deals are still going strong on ebay in 2019. I was able to pick up this red one for $19.80 (including shipping). If you are looking to add some additional cars at a fair value I suggest considering one.
I’m not sure why these cars haven’t gained a lot of popularity. The real car does have a following by American sports car enthusiasts.
This car requires a little bit of cleanup; I’ll do that this weekend and post back how it handles on the track.