My name is Damian and we recently got our first app approved in the store. Its a very simple to setup and use app to do upsells and cross-sells. Currently works only on stores with cart page (no ajax atm) but I'd be very interested in having you try it out. It doesn't do any fancy stuff but its got 3 big advantages over other apps
1) Its popup is very responsive and looks great, compared to others
2) It is compliant with EU & German law
3) Its only 9.99 $ a month
We offer a free 14 day trial, which I'll gladly extend to a month to community members.