What are some easy non-expensive ways to clean a toilet?
Put 1/3 vinegar, 2/3 water in a reusable spray container (you can buy unused ones at many hardware stores and gardening supply stores). 

Spray the exterior of the toilet, then wipe with whatever you want to use. You could use a couple of hand towels, cloth diapers, whatever. 

The vinegar is a good disinfectant and is very eco-friendly. Toss the cloths into the laundry and wash normally. The vinegar should prevent any nasties from growing for a day or so. If no one is making a huge mess around the toilet (like a potty-training child), you only need to clean it once a week, so just plan to clean it the day before you usually do laundry.