It's a 10k ohm resistor, they're very common. You don't
have to replace it with an SMD type resistor (though you'll have to be creative about how you wire the new one in), you can use a through hole version instead, but you can't buy just one unless maybe your local Maplin has a parts desk. If you know any electronics hobbyists they'll definitely have one you can have, if not I usually buy stuff like this from
here.