SJS cycles for instance, search130 bcd 52t dural chainring and they are 8 and 9 speed (compatible with both)
I've used then to replace FSA chainrings in the past and tbf, they didnt have the same quality of ramping but....as a workmanlike alternative at a good cost, they worked perfectly well enough and did last well. Meh, they probably dont shift quite as well but not terribly either. Its compromise, cost against quality, to me,, they were a good compromise.