Yes, graded paper is still made, and some of us even prefer it. The older Aristo heads put out a greenish light.

For 4x5" and smaller, you might just get a Graflarger head that will fit on any 4x5" camera with a Graflok back and concentrate your efforts on a larger head for a bigger enlarger. Graflarger backs can often be found for around $100 or less, and Aristo can even upgrade the tube.