AC-DC Linear Power Supply 6VDC @ 500mA; 1.7 x 4.0mm Positive center polarity; Part # D-6500SY
by PHC Enterprise, Inc.
$9.00
Part #: D-6500SY
Input: 120VAC
Output: 6VDC @ 500mA
Plug: 1.7 x 4.0mm 
Plug modified from Panasonic PQLV219 power supply