I used Americlean.
Dryer vent cleaning isn't the same as duct cleaning. Heating and A/C ducts do not need to be cleaned. The coupon people offer $85 to vaccuum up the heating/AC vents, but then tell you that it is ineffective and they need to clean out the system and in wall ducts for another $400-500. It's all B.S.
Dryer vents in condos have a tube that spits out hot air and humidity outside. It gets clogged with lint and is a fired hazard. My dryer duct is only 1 foot and doesn't need cleaning, but if you have your dryer more than 10 feet from an exterior wall, it can get clogged over time. They either vaccuum it out, or shoot air from the inside out if you are on a high floor.
Costs about $100.
FYI, if you have time to go over your CC&R's, note the tube is in between the interior and exterior of your unit. So if the CC&R's don't explicitly say you are responsible for them, technically the condo is supposed to pay for the maintenance of it. In the end, it won't save you any money, because then the condo contracts the work out and just raises the condo fee to pay for it.