Summarizing values from different worksheets to one summary worksheet

Happy New Year!
I have two worksheets showing shopping cost summary for Person A and Person B. Each person enters the price of the item they purchase as the purchases are being made so there will be duplicate item entries with different prices (i.e. an eraser costs $4 in shopA but $3 in shopB, these values were entered separatedly)

I have a cost Summary worksheet that list all the items these two shoppers will eventually purchase. How can I summarize the inputs from PersonA and PersonB's shopping list in the cost summary sheet without going through each item and adding the cost one by one as I've done here?

Thanks!