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You can get a very cheap metal detector that would do fine.
Bounty Hunter Tracker IV is cheap especially if you use a hobby lobby coupon for 40% off. only cost like 70 or so bucks tops.
Also lot of cheap ones in the 200 price range that do really well, Fisher f2, Eurotek Pro, Garret 250, I hear is great, If you want a beep and dig then the Tesoro Compadre.
If you need ground balance due to soil mineralization ypu need one with ground balance and they cost 400 or so.
But the 200 dollar ones should last you a life time if you take care of them and don't need ground balance.
On a fair ground your jackpot would be jewelery.
Here is stuff I found on an outing.
