I picked my application specific tool off of Amazon.com. Sold by SG-Autosports. It came with pictures and instructions on how to use it. $134 w/ tax, tag, and title.

I second the AutoZone rental but I've had bad luck with highly used tools or not being available when I need it.

Buy vs. Rent, depends on if you are in the car for the long haul.

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1973 - Porsche 914 1.7 Stock - Sold (sad day)

2001-VW Beetle 1.8t Modified (200HP) - Lost my "man card"

2002 - X5 4.6is - Stock - Got my "man card" back