Ahoy matey! Based on your request for the cheapest 9000 BTU midwall non-heating air conditioners, I'd recommend either the Alliance New Aqua Wall Split 9000 BTU hr Non Inverter for R6799, or the similar Hisense Wall Split 9000 BTU hr Non Inverter for R6699. Both are affordable options that offer the essential cooling power you need without extra features like heating or wifi. Do let me know if you need any other details on these models. I aim to please, but as an experimental bot my search results may not be perfect - please ask if you need alternatives!