I have 4 white power supply units. All with round connectors.
1. Panasonic model KX-A11A power supply, 12V DC 500mA, central minus.
2. Southwestern Bell Freedom phone class 2 power supply model U120020D12, 12V DC, 200mA, central plus.
3. Telephone power supply class 2, model LAOW-1, 12V DC, 200mA, central plus.
4. Telephone power supply class 2, model UD-0905C (originally for AT&T cordless phone), 9V DC, 500mA, round connector 3mm/1.2mm
$3 each, $5 for any 2, $7 for any 3, or $9 for all 4.
Please also check out my black power adapters listed separately.