As Sandyf stated, the Tracfone is something you may want to look at. With the right Tracfone bundle, you OWN the phone, plus you get talk minutes/text/data all together for 1 year for under $100 one time charge. The models that are 5 inch screen, 5.3", 5.5, or 5.7"are the ones I'd think about since anything smaller makes it hard to see. Ebay or HSN are the places to look at them.
If you need more help, let us know and I'd be glad to recommend a model based on hearing more about your requirements.
We have Tracfone 5.3 inch LG and Motorola 5.7 inch phones with 1500 minutes talk, text and 1.5 GB data for $79 and $89.