Amp Back in Stock | PreOrder

This app works fine but is priced wrong. It should be priced by number of emails vs a monthly limit. The way most stores will use it will hit the limit every month making the lowest plan worthless. When a product goes out of stock for us, it is out of stock for a month or two. We may not send an email for many months because a shipment hasn't arrived. However, once a container arrives a ton of products get back in stock, there are 500 people waiting and we always hit the email limit. So we can go 4 months paying $20 for no emails and then when we really need this app, it throttles us down and we can only send out 100 emails and need to pay more? It would be nice if we could just roll over our unused emails each month. We switched to a free back in stock app that is just as good and has no limits.