5litre keg's

finally made a desision on which draught beer dispenser to get for my fiancee for chritmas, chose agianst the carlsberge draughtmaster as means can ONLY have carlsberg and also have to get special kegs, so may be difficult to get hold off if these become less popular whereas always be able to get the 5litre ordinary kegs.

so anyways, im wonderimg if anyone knows of a site that sells 5litre kegs cheap, not minding which beers, though needs to be lager not bitter. i want to start getting differnet beers now, named beers i.e. heineken, carlsberg, carling etc. be cool, but some foreign beers he's not changed be cool too.

if possible like to get for under tenner each or there abouts.

thanks for any help