online really cheap, usually because:
A)The person selling it doesn't know what it is.
B) There isn't a big demand for them, so they go for a song.
Check out the usual suspects (Auction Sites) for a week or so and you'll see what I mean! I got mine for $5 and it had etched milliliter markings.
If they drive God from the earth, we shall shelter Him underground - Dostoevsky