It's all very well for you in Norfolk to put in your pennyworth on this one.
From the economist.com
Now I want to put in my pennyworth.
From the telegraph.co.uk
Just to add my two pennyworth.
From the guardian.co.uk
The moralists amongst you can froth and mutter about how England have conducted themselves away from the playing and training fields, and I have had my two pennyworth on that subject.
From the telegraph.co.uk
I think you nailed it with the first comment, and I would not have bothered to add my own two pennyworth if Robinson's turgid article hadn't made me so cross.
From the guardian.co.uk
More examples
The amount that can be bought for a penny
A bargain of a specified kind; e.g., Well, that was a bad pennyworth.