Tell you what, we can do the deal 0.25 BTC at a time.

You send 0.25 BTC, then I'll send $7 PayPal.
Then you send another 0.25 BTC, and then I'll send another $7 PayPal.
We continue until you've sent all the BTC.

That way if I fail to send at any time, the most you lose is $7, but if I want to continue to receive the discounted BTC, the only way to do so is for me to continue sending.

$7 per 0.25 BTC = $28/BTC = $470.40 for all of it.  You get an extra $0.40 more than my initial offer that way as well.

This (and my previous) offer are only good until 2013-02-24 06:00:00 UTC