Here are a few options non-amazon to directly support Monasteries: https://store.vashonmonks.com/all-hand-made-prayer-ropes/
https://www.holycross.org/search?q=Prayer+rope
https://catalog.obitel-minsk.com/catalogsearch/result//?q=prayer%20rope
If it must be Amazon: https://www.amazon.com/dp/B096YJYFXG/