As for laptops, I can vouch for the aforementioned and well-known Vikings
store. The x200 I bought from them works flawlessly with free software and I
am currently running Parabola on it.
If you check out the libreboot website, you will find a few laptops that can
be flashed using software only. Those might be worth a look.
When it comes to WiFi USB dongles, I have successfully used unbranded/not
very well known ones with the AR9271 and another chipset (that I can't recall
the name of right now).
As for bluetooth USB dongles, CSR 4.0 dongles are cheap and readily
available. They work perfectly well.
Desktop computers will be a bit harder due to the motherboard. If you were to
get a libreboot compatible motherboard, Intel is the right way to go. (Also,
I will be jealus xD)
