>>307935this is just my personal opinion.
I own a carbon blade opinel no.8 and it was one of my favorite knives. Very sharp. Comfortable handle. Locking ring. But the carbon steel is very vulnerable to rust. Always keep wipe clean and dry after use. i mainly used mine for food prep and it developed an attractive patina but it also started to smell odd after a month or so. This may have been my own fault because it is hard to dry the inside of the especially the part where the pivot is. I didn't like how easy the blade rusted and felt it was just a bit too short so I am looking to buy a stainless no.9 now.
As far as were to buy, wherever has it cheapest I guess? Ebay and amazon is where I usually look.