Etsy
Ebay
…and maybe any other auction/craft selling website- I know there are quite a few but the two listed above are the main ones that I can think of.
I’ve found quite a lot of very beautiful vintage catholic statues on Ebay. If you want vintage chalkware statues just look up “Catholic chalkware” or “chalkware” which will have a subcategory listed as “religious”. Usually all the religious chalkware are Catholic items.
Etsy would be more homemade things and things that people made, carved, sculpted, constructed… you get the idea. On Etsy, there are quite a few sellers of vintage re-cast Catholic medals and rosary findings which are beautiful. I think some might even make the rosary to your specifics also if you asked.
There is much to be found on these two websites! Happy gifting!