My timer remote cord for the 550D arrived yesterday - here's the unboxing video.
I ordered it for 24.30 Euros ($29.98) on ebay (shipping for free). The seller was "digital-winway" and shipping to Germany took less than two weeks. On the packaging the model is named "RS-60E3", in the instruction manual it's "MC-36B", which I think is correct (google search). Build quality is really good, the buttons seem to last a while and even the display is illuminated. Another great thing is that batteries are included, even if this is not mentioned in the article description. I would say this is definitely a good deal. By the way, the manual is in English.
This is not the cheapest remote cord for the 550D, but I decided to buy this one because it looks reliable and i has two batteries - which means it can work a while. It's also very important to mention that you can set the number of shots to infinity. This is what you need when shooting timelapses - and that's what I bought this thing for ;)
timer delay: 0s up to ~100h
exposure time: 0s up to ~100h
interval: 1s up to ~100h
number of shots: 1 to 399 or -- (unlimited)
power: 2x AAA 1.5V alkine batteries
battery life: 2 months of continuous shooting
Here you go with my first and second test video and some tips for timelapse photography.