You won't find a good quality 2-channel cam at that price. The cheapest ones I'd recommend are the Mini 0906 and the Viofo A129, which is a new model so expect a few bugs with it. Viofo is great at getting things working right with this series of cams so don't let that worry you.
Quality costs, but it pays off in time with good service. Cheap cams are endless frustration. Spend a little more and get a good cam- you won't regret it.
Phil