I can't recommend GLUGLUG highly enough. I purchased one of the X60s laptops
soon after GLUGLUG was launched (I like to think it was one fo the first :))
and the level of service has been top notch ever since. Since that time they
have expanded the supported hardware list and have provided gratis updates to
libreboot for my X60s machine and the other supported machines.
The "please ask before ordering" statement you highlight demonstrates this.
They are asking you to contact them before placing any order to ensure the
service they offer is what you need for your machine. This ensures you don't
pay for something that is not what you want or need. This demonstrates
respect to you as a potential customer. Remember also, GLUGLUG is affiliated
with the Libreboot project and so they don't even expect you to purchase one
of their machines. They can install Libreboot for you on a machine you buy
separtely. Another denmonstration of their level of service.
Even if you drop into their irc channel #libreboot, they will be more than
willingly to assist you in your own efforts. This has been my experience at
least.