Check out Ebay. Do a full text search for :
lab power supply
constant current
regulated power supply
dc power supply
or any other combination you can come up with to narrow it down.
If the ad listing doesn't specify constant current as a feature, look closely at the photo. Usually you can see a switch labeled Constant Current, or CC, or if it has a dial to adjust the amps.
There have been a number of them for $20-$100. Make sure it is a DC power supply and that it will be of sufficient voltage and amps (watch out for the decimal point in the listings- some listings will say amps but mean milliamps). Look at the dial on the meter (if analog) to give you a better idea of the capacity. The output terminals are also usually labeled with the max current/max voltage. Also, do a search on the part number to get the specs.
I got a nice 15a/30v, Constant Current/Constant Voltage unit for $40 (remember..these things are heavy, so expect to pay $20-$30 shipping).
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