For $30 you can get a pair of Yongnuo RF-603 II (
link). They're manual only, but have a decent range. One goes on your hot shoe, the other goes on the foot of your flash. (Feet go in shoes, right? I don't think I'd call it a male shoe...
) you can also use these to remote trigger your camera if you connect a Canon C1 cable between this and the shutter socket on your camera.
There are a couple different versions, so to be safe make sure you buy the RF-603
II. The N and C designations are for waking the flash up from sleep on a half press of the shutter on Nikon or Canon, but for other brands they'll just listen for a shutter signal from the center pin. (Just take a random shot and it will wake up the flashes.) The C1 version comes with a cable that can connect to your camera for remote triggering, but both N and C will work if you have the cable already. (I have a few RF-603N II that work great with my K-3)
If you buy the original RF-603 (not version II) I believe the N (Nikon) version will work as well, but the C (Canon) version won't trigger from a Pentax camera without modifying some circuitry inside. I know because I had to solder the extra switch and resistor in mine before the II came out.