Rain Barrel from the RiverSmart Homes Program
Any homeowner can apply for the program here and once you’re on the list someone from RiverSmart will visit your house to assess what you qualify for (rain barrels, shade trees, pervious pavers, etc).
Afterwards there is a bit of a wait, but eventually they’ll get to you. Unfortunately we had to wait 8 months and brave a few heavy downpours that leaked water into the basement. At one point I considered building a rain barrel system myself. This dude has a nice tutorial on doing it super cheap, but if you’d like something a bit prettier I’d suggest either the Algreen Cascata 65-Gallon or the Fiskars Salsa 58-Gallon system.