This is likely a dumb question, but can anybody tell me the cheapest place to buy a TRANSMISSION DIPSTICK for a 1974 Ford E100, V8, van?

The only place I could find is on Ebay and they want $28.21 (including shipping)l.
Here is the link for what I found:

http://www.ebay.com/itm/BTP-7404-Straight-Transmission-Dipstick-/311850110138?fits=Year%3A1974%7CMake%3AFord%7CModel%3AE-100+Econoline&epid=776532377&hash=item489bb70cba:g:vPoAAOSwJ4hY9eyt&vxp=mtr

I was just curious if there is a cheaper place to buy it from? I did check the larger/common website such as carparts/autozone/etc, but I can't seem to confirm compatibility with my van on those websites.

Here is a photo of my van where the dipstick is (see below).. I'm looking to replace my dipstick because there are NO markings on my dipstick so I'm trying to just replace it so I know exactly how much transmission fluid is in it. That seems a lot easier than dumping all the transmission fluid and refilling it/etc...

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http://www.puzzele.com/clouddancer/clouddancer.htm