My latest relay board solution is based upon information from this Instructable. It uses the "SainSmart 5V 2-Channel Solid State Relay Board for Arduino Uno Duemilanove MEGA2560 MEGA1280 ARM DSP PIC" for about $16 via Amazon.

• (2) Solid State Relays
  • Power Supply: 5VDC 160mA (all channels ON)
  • Input Ctrl Sig:
    • 0-0.5V = LOW
    • 2.5-20V = HIGH
  • Load: 75-264VAC, 0.1-2A
• Phototriac isolation

Concerns:

Output/Load/Switching side of relay on works as expected for AC loads. If DC load, it latches when activated, waiting on AC cycle to reset it--which of course never happens.