Not in Hernando County, Florida. Or Pasco County, Florida, or Suffolk or Nassau Counties in New York. I'll have to check on Tampa.

http://commons.wikimedia.org/wiki/File:MTA_New_York_City_Bus_5740_in_Select_Bus_- Service_Bx12.jpg

http://commons.wikimedia.org/wiki/File:NYC_Transit_New_Flyer_5473.jpg

http://commons.wikimedia.org/wiki/File:MTA_Bus_New_Flyer_5351.jpg

As for NYC, I've seen pictures of some, but I never had a reason to ride one.