My current collection is also heavily built upon Reddit's stuff. Funny quotes do seem to be more limited, there.

There used to be a really tasty, bottled apple juice (called "Elliot's" I think) that had these great, whimsical little quotes on the inside of each bottle cap. I wrote a whole bunch of them down, but have since last the file, dammit. I'll have to search around to see if there's a similar collection online...