yes, rimfire magic do them and so do other places. £14 delivered mine was. It makes a huge difference
my understanding of creeping is that its the amount of play the trigger before the firing pin goes. the standard trigger on mine was stiff and jerky which caused pulling of shots (it was a new rifle to a new FAC holder)
changed to the middle spring option in the kit and bosh, no floppy or jerky trigger, just a short precise pull and bang