Just a head's up - you can get a six pack of McCann's 28 oz. tins from Amazon right now for $21.20, or about $3.54 a tin.
McCANN'S Traditional Oatmeal, 28 Ounce Tins (Pack of 6)
Choose "Subscribe and Save" to save 15% (don't forget to cancel subscription after order goes through)
Use promotional code OATMEA98 to save another 15%
Total should be $21.20 with free shipping.