I wonder if I could have some advice about an on-camera flash transmitter unit compatible with the Canon EX430 mk I speedlight. I own the latter and would like to experiment with off-camera flash. Rather than using wires I hoped I could use a wireless transmitter unit. I know that other flashes such as the EX580 have built-in transmitters to control the EX430 as a slave, but I don't want to buy a second speedlight just to control my existing one. I also don't want to buy a pair of (eBay style) transmitter/receiver units, nor the dedicated and very expensive Canon ST-E2 unit, I want to make use of the receiver built-in to the EX430 with a smaller cheaper affair.
Can someone recommend a unit that will attached to the hotshoe of the camera (EOS 550D) and control the flash wirelessly using the flash's own built-in receiver, please?
My budget is around £20.
Thanks in advance,