The official canon ones are shown on this page, no doubt 3rd parties make their equivalents, so you should be able to cross match. Cheapest is the RC-5 but I don't know if it will let you do bulb exposures.
7D has an IR port like some other Canons. I use the tiny little RC-1 (does everything) or RC-5 would be good alternatives to a cable. Some third party manufacturers also make IR releases with more range I think.
I got one of the yongnuo's (yn-126 I think or the 128) which is wireless & covers a range of upto 100m - not that I really fancy leaving my camera 100m's away
Comes in two parts - the remote itself and the reciever that attaches on the hot shoe with the lead going into the 10 pin port (Nikon camera)
Its got all the bits/bobs on it - bulb, single, multiple shots, timer.... Can be found on the likes of Amazon & Ebay for around the £15-£20 mark (if not cheaper)
edit: (something similar can be - as just looked )
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