I should've taken a picture of the bananas, but here's a picture of limes being sold for three for a penny:

https://www.klos.com/~john/limes.jpeg

That's a tad pedantic. They add the . so people immediately know its not $29, and that it's a low number. No one sells things for decimals of a penny. I think they gain more legibility than they lose on average by writing it that way.

Where does it say 3 limes for a penny? It clearly says 1 lime for $0.29? It says it 3 times in that photo, but I don't see the penny claim anywhere.

No, the (painted) sign is saying .29¢, not $.29. It's a hundred times cheaper than $.29.

It says limes are 0.29 cents each on the sign, not $0.29.

I wonder if they can argue that the "painted sign" is just entertainment; the actual sticker in the lower right is correct (.29$ and 29¢)

It says .29 cents not dollars :)

The painted part says “.29c”

$ !== ¢