It's looking as though Facebook and HTC may have crafted a device that isn't selling too well, if a recent price drop is any indicator. AT&T has dropped the new two-year contract price to just $0.99, or basically free. The regular price has also seen a reduction of $100, settling to a new price of just $350.99 off contract.
We can't draw a complete conclusion on just how well the device is selling as no sales numbers have been released. However, a price drop this early into a product's life cycle certainly doesn't bode well for future performance. It's possible that making Facebook Home available on other Android devices, devices with better specs, may have hurt HTC's ability to sell the First.