We have a Thiesen's (along the same lines as Farm and Fleet) that I actually stopped at just a little bit ago. No sprinkler supplies that I was able to find, but the did have some very nice graduated cylindars with a pour spout and handle in 250ml sizes and up.
The mom and pop Hardware store has the rubber stoppers that I would need. So between it and Menard's I should be able to get all the parts I would need except suction cups to mount it. I'm working out the design in my head if I decide to build it from scratch.
I've still got one more LFS
that I want to go to before I make a final decision. With as cold as it was this weekend, I really wasn't feeling up to making the 30 min drive to the next city over. Maybe next weekend.