There are 2 spare esata ports on the motherboard.
http://eshop.macsales.com/item/Newer%20Technology/MPQXES2/
For $25 plus shipping you have 2 external esata ports.
Easier to swap drives by unplugging a cable or 2 than taking your machine apart.

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I had just been in a regular PC shop in Munich (Germany) where they sell such adapters with a single eSATA connector for 5 Euro, which is about 7-8 US$.

Nevertech is asking a lot of money.

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If a $29 drive sled is a lot of money, you bought the wrong computer. That's like 1% of the purchase price of the computer. I'm not going to jury-rig a physically unattached hard drive laying on felt into a $3K computer. How clever will you feel if/when the SATA connector on the backplane breaks or the drive overhead from sitting on felt and having no airflow?

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