just as root assasin has said. i tether my regular phone to my laptop.
in the UK you can find all kind of reasonably deals,
for example most companies offer packages where for £20 a month you get 3GB download limit, average speed like you;re asking, (location dependant). and they'll also give you a free laptop as well.
(minumin contract term is usually 24 months).
look around at the phone suppliers websites and see what you can get.