The 117 durability cost 20 - 25 rows, while the low durability only cost 10 - 15 rows. Because once the durability gets low, you can't fixed or repair it to make the durability high again. That's why the high durability is more expensive than low durability.
Function is still same high durability or not,
The different prices just for the market / merchant's purpose,
I think you still can get 20~25 Rows for Uber Kantata Ring of Poison.