Hello
Go here: http://electronickits.com/start.html?BID=1799&AID=11540
and check: POWER SUPPLIES -> DC Bench Power Supply Kit
Output Voltage:
1) 1.5VDC - 15VDC @ 1Amp
2) -1.5VDC to -15VDC
3) 5VDC @ 3 Amps
Input: 110VAC (line cord included).
Includes full enclosure and knobs
Features short circuit protection on all supplies
Variable outputs can be stacked to get 3-30VDC @ 1Amp
Price : 54.95$ (as kit) or 89.95$ (assembled)