yes go to your yellow pages and look up your local bearing suppliers.
my local one is called j & m belts, when i used to have a kart i used to get the engine bearing from there. from a specific kart shop they would be about the 50 quid mark for the kit, from the bearing guy they were about 12 quid, and of a higher quality. he stocked sealed and loose bearings in every imaginable size, its worth a try
Dave