I still challenge anyone to beat this one for $10:
LM317 / LM337 +/-1.5V~37V Adjustable Dual Voltage Regulator Power Board | eBay
LM317 / LM337 +/-1.5V~37V Adjustable Dual Voltage Regulator Power Board | eBay
It's oversized for your current requirement, but it's switching.
500W +/-30V Amplifier Dual-voltage PSU Audio Amp Switching Power Supply Board | eBay
500W +/-30V Amplifier Dual-voltage PSU Audio Amp Switching Power Supply Board | eBay
The one I mentioned is $7.50 at Parts Express. Its basically the same, a LM317/LM337 regulator board.
Adjustable Voltage Regulator Power Supply Board +/- 1.25V to 37V DC Output LM317/LM337 Design
Thanks guys for the suggestions. I settled for the GRLV in the end because I managed to get some boards from someone on head-case.
