If you are talking about the kind that have a double hole in the top where the choke rod fits and then clips to the choke shaft, the last time I was in O'Reilly they had different sizes blister packed over in the HELP section.
I picked up an assortment pack for our trans linkages, they have larger holes and shafts. I didn't see any small ones that would fit the choke pull-off in there.... they didn't have any other similar clip packages with those either. Hopefully it's just the stores near me and his will have the right size...