This 55 gallon rain barrel collects and stores water for watering. I had trouble finding one of these used. I didn't want to pay for a new one, $80 just isn't in my price range. Finally I friend had this lying around in his woods so he gave it to me. I can't really beat free.
There was some patching required, notably almost the entire base was cut out and in the top was missing it's screw in plug. To fix the missing plug I used a disc cut from a plastic paint can lid on each side and silicone gel to hold it all together.
The large square hole is covered with netting to keep out mosquitoes and debris.
Here's the current setup. The gutter system captures less than a quarter of my roof area but even an inch of rain fills the barrel. I think I have space to add an additional barrel if I could find one on the cheap.