Now take this with a grain of salt. There's a very active thread going on at FW debating the validity of the HDHomeRun PRIME Tuner which Amazon.com has for pre-order.

Now, some suspicious things here. First, There doesn't appear to be a product page, but you can add it to the cart. Second, someone posted a chat with SiliconDust where they claim that Amazon.com is not an authorized pre-order website.
That being said, Amazon is still letting you place orders for the Amazon HDHomeRun PRIME, and at $202 with free shipping, that's over $50 savings versus the Newegg pre-order price.
So if you're interested....keep us posted!
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Of particular interest is this info from Nick on the SD forums:
"The price is below MAP which means they are not complying with the distribution agreement. We won't be shipping product to Amazon until this is resolved."
"The general-availability MAP price is the same as NewEgg pre-orders at $249."