are we talking UK or overseas?
if the former, I've got a Dongle from Orange ,. . . 18month contract, £9.49 a month, 1 gb download which, unless you're downloading heaps of movies / games / music will be more than sufficient.
I build and upload websites using mine, so if you can get mobile reception, you can get wi-fi.
In my pre-dongle days, I used wi-fi on sites but its pricey. Windermere CCC was £6 for 24 hours, 2007, Leiston private site, 2009, £3 for the same.
Overseas, you could use then dongle but you'd need to be very careful about overseas costs - especially as connection speed will be slower than your home broadband.
