Back In Stock,Notify Me: Kbite

Not only does this app have perfect reviews, but it's more affordable than other Back in Stock apps. I've tried a few others and the interface here is super easy to use. In addition, support is great. Sam was able to assist with integration to the point that I didn't even need to do anything. Give this app a try, even do the free trial, you won't be disappointed. I did the free trial and upgraded within an hour.