We brought our own cheapies from WalMart (under $2). Stuffed them full of socks, etc. to minimize their packing impact. Same stuff for sale on CC seemed to be about 5x that much (although I wouldn't swear to that). Our philosophy was that we could have left/lost them on the island without it being a tragedy.
We did the same thing as you. We went up to Scuttle's Cove area where the kids clubs are on the beach, and asked if we could use some beach toys. They had all kinds of goodies and there was no charge at all. Perfect!
Ann
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