Can you use refill cups from sand castle? Also can you use last year's refill cups this year. Thank you

No and no. New one each season and they are idlewild exclusive.

1 of the stands said you could but it was way expensive better to buy new n refil

Actually you can use last year's cups, but the refills are way more expensive. I think it was $3.50 for a refill.

You can refill last years idlewild season cups for the price of a small drink after tax which is $4.02