Cheap fast trustable laptop computer

It's that time of the month, folks.  I feel like buying a replacement laptop, yet x86-grade power consumption and non-free BIOSes are quite a turn-down.  Are there any cheap (under 600$), fast (comparable to, say, an Intel T3400), trustable (no binary blobs) laptop (screen size between 12 and 17 inches) computers out there?  Availability of 6-cell battery also a requirement.

Probably not.

Non-free BIOS on any general purpose computer are the exception, not the standard. The Lemote Yeelong would be one of the two famous free bios computers (the other being the XO)