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@Alc
You get different grades and hardnesses too. The grade refers to how round they are. The smaller the number the better. Have bought from http://simplybearings.co.uk/shop/ before. The ones on ebay typically are grade 100 or above - so okay for some stuff. Campag specify grade 25 or better for their components and fully through hardened.
Also you shouldn't mix and match ball bearing batches, so if you buy some new ones dont mix them with your olds ones. You could take any remaining ball bearings into a bike shop and they could tell you what size they are. Or see if there are any hints on sheldon.