I don't always use the end of the tin so I buy the cheapest possible in case I have to throw it away. I use loads of cling film before I put them in the fridge. I have bought the jars but they take even longer to use in my experience.
But then we established on another thread that I am profligate and have more money than sense!! 
Retiring and living frugally in money from downsizing after years of stress
HRT - Starting for the first time at age 66.




Soz. x