I need a cheap phone (and plan) that will help me run my small eBay bussiness. Any suggestions?

So ya I requirement a sound and a organisation that are inexpensive, so I crapper separate this lil eBay bussiness on the go. (I also poverty the internet on it). So waht is the cheapest artefact to intend it all, texts, telecommunicate internet everything I requirement for this bussiness.