These might be pretty standard, but when I first came to Japan my host mother took me to a conveyor-belt sushi restaurant and just let loose on the puns:
いかいかが? How about some squid?
いくらいくら? How much do the salmon eggs cost?
はまちハウマッチ? How much does the hamachi cost? (That one’s Japanglish, but ah well )
And one I made up in response:
あじのあじは?How’s the mackerel taste?