compressed air - where to buy it.

hi.

my sisters cpu hit 56 celsius when her doughter played so i told her to clean out the dust, i believe its a 7cm layer in her case if not more as she has a full tower but need some help.

some of you in here live in uk so perhaps any of you can tell me where she can go to get a can of compressed air and what the name on the can is ?

she lives in birmingham.

Regards

Raven

Maplin do some,

http://www.maplin.co.uk/Module.aspx?ModuleNo=25351&criteria=air&doy=3m5

kustompc's do it aswell

thanks for the help