Oil Barrel is an inexpensive item that can be bought from the cheap items section in Nook's Cranny. You can also find it inside the balloons.
You can't craft Oil Barrel but you can buy it from the sellers below.
Source notes: Available in all tiers of shops, including Timmy & Tommy before the shop is opened
|Craftable: No||Customizable: n/a||Catalog: Yes|
|Source: Nook's Cranny||Size: 1x1||HHA Series:|