they sometimes do but it depends on your play style, I would order about 20 to 30 of them.... they are really cheap and its kind of a waste of shipping to send only one.
I would also order 2 of each color men, 2-3 bumpers, 2-3 bearings, and 1 bearing nut.
With all that you should be good to go for quite some time. First you want to look over all the men and make sure there not cracked if they are order replacements for them, and also look at the bumpers to make sure they are good to, and order replacements for them as well.....
when its all said and done you would want to have ordered enough stuff to fix the broken pieces and still have the number of stuff extra i said above.