I don't know how much any extra would cost. We were there this week and each person gets a mesh bag with a mask, snorkel and a sample-size sunscreen. It's very thick and a little goes a long way. I really didn't like it though. It's very greasy and so thick it's hard to spread it out. It's in a little envelope with a tear-off top, which is a problem since you can't recap it, but you don't want to throw it away since there is leftover for use later in the day. I ended up burned since I wasn't as diligent with it as I should have been. Also, it was kind-of cool and partly overcast, but you can never be too careful with the Florida sun!