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Lark in the Morning sells a fiberglass model:

http://larkinthemorning.com/product.asp ... 1103175290

And there's a web page on building a square one from plywood:

http://www.serpentwebsite.com/

Try the rum balls, too!

Check out Doug Yeo's (bass bone Boston Symphony Orch) website: www.yeodoug.com

He is a Serpent virtuoso. I believe he plays one made by Chritopher Monk (could be mistaken).

On his site you will find some articles about the serpent "Tempted by a Serpent."

Good luck!

My uncle made me a wooden one that plays great. I will try to post a picture later today.