If you search the web using the terms
toy cash registers
 
you will get many hits, although note -- most are now "electronic"  style -- 
they show bar codes and prices on a screen and some also talk and  beep!
I did not see one that had pop up numbers however I did not  open all the 
hits.
Most are a decent size and seem sturdy
Price top up to about $70
 
Best wishes, Barbara Hass, retired  librarian





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