Sure possible. We have plugin for getResponse. Enable newsletter module in aMember CP -> Setup -> Plugins then enable getResponse plugin in aMember CP -> Setup -> plugins -> newsletter plugins.
Please go to aMember CP -> Configuration -> Setup/Configuration -> Plugins and enable newsletters module first. Then you will be able to enable getResponse plugin on same page in section 'Newsletter Plugins'. Then go to aMember CP -> Configuration -> Setup/Configuration -> GetResponce and configure plugin. You will be able to set up access to subscription in GetResponce based on purchased products at aMember CP -> Protect Content -> Newsletter