You can get a Ford Ranger bed liner delivered right to your door in several types and models. You will find local dealers for some of these too but it's easier to just get it delivered in most cases. Here are some of the options and some options that are missing as well.
If you want a Ford Ranger plastic bed liner you are in luck. Some dealers will deliver either a Pendaliner or a Duraliner to your home. These liners are inexpensive and very tough and both are by Penda. The only thing to watch for is the possibility of damage to your bed from the liner. That happens if the liner gets loose and wears away some of the paint from the bed. It may not happen but just be aware of the chance. My favorite plastic liner, the Dual Liner, does not make a model to fit the Ranger. Though they do have Ford bed liners but just for certain models.
The leading carpet bed liner, the BedRug, makes a liner for the Ranger. You can get full bed coverage in the custom fit BedRug. That is a good plan for use under a tonneau or bed cap. It's a tough liner but not such a good idea for grimy, greasy loads. Then another option might be best...
Look at the bed mats too. You can get the BedRug brand in a mat too. You can go with the rubber bed mats as another way to deal with real messes. Options here are the TrailFX, Protect and a host of others. Theses mats are tough and also work well on top of other liners to protect the liner as well as the bed of the truck.
Then you could go with one of the many bed liner spray options. I'm liking the looks of the Al's liner products. This is related to the Scorpion Liners that are put on by dealers. In any case, just like any truck, the Ford Ranger bed liner can surely be put on with liner paint. That goes for the do it yourself liner materials as well as the professionally installed liners like the Line-X or the Rhino Liners or one of many others like the Speedliner. Well, the possibilities are nearly endless.