Wanted: Dune Buggy

Would love to get my hands on a perferably working dune buggy or sand rail. Something fun that is reliable that i can let my roommates son drive around our property. Im thinkin an old VW bug thats been dune buggyied, or maybe a custom made sand rail, or something similar. Just let me know what you have, and well go from there. im not expecting anything new, and i sure cant afford anything new.