How many outputs? Voltage and current requirements? Linear or switching?
These will make a huge difference in cost. Options are also available for constant current along with voltage but most folks may not need that capability.
One without a digital display will likely cost less but with the drawback that you need to use a multimeter for better accuracy.
There are a lot of used supplies on eBay at any given time. I have an old HP 6249A 0-40V, 0-1.5A. It's constant voltage and current. I use this all a lot and it's indispensable. I have a few others that I built as well. A plain jane +/- 15V for powering op-amp circuits, a couple of 5V voltage regulated for other low voltage stuff. Also a high voltage supply for prototyping tube circuits.
Not sure if this helps much but defining what you are doing to do will help a lot.
mike