Our home depot sure dosn't sell them. I agree that a great alternative is the Rubbermaid Commercial cans, they are usually grey. They are HEAVY though, so once you get them loaded it may be a 2 man job getting them in a truck. At least the handles dosn't just rip off like the cheaper ones...
I've found that rectulangular storage bins, the big ones, work awesome for shrub trimmings, cleaning out beds, etc. They are low to the ground so it's easier to get stuff into them, wind dosn't blow them over (usually) and they have a lot more uses than a normal 33 gallon trash can.