Any cheap and nice tool to gather and monitor logs from Android Apps?

As my app's growing my associates and I faced the need of gathering events/logs from our customers as our app cannot really be tested in every environment (or, at least, this would require too much testing and would be way time consuming than if we keep things simple as we are doing for the moment).

So basically we've tried out tools like Bugfender & Papertrail and although we were quite happy with them, as a startup we felt like we were definitely struggling with their pricing. We are not a profitable (yet?!) company. We can afford services where it goes up to $20/month at most, but $100 is, in our opinion, way too much as we are trying to grow and that we have to limit our expenses (how do we get profitable otherwise?).

So here goes my question: as potential mobile app developers, have you guys ever heard of any cheap and nice tool (either SaaS or self-hosted) to collect events and logs from installed android app on customers' devices just so we can monitor them and track their activity?