What kind of part? I use Octopart for a lot of things, like ICs (sometimes some variants are available in low quantities but others aren't and only in thousands).
For stuff like passives it's usually easier to use Digi-Key or Mouser and you can filter by MOQ so you only see things that are available individually.
the most annoying was stuff like resistors or capacitors. They tended to have huge minimum order quantities, there were hundreds of results for any kind of query and most of them were always out of stock. I wanted to stick to JLCPCB's platform so that I could order the boards pre-populated, but I didn't want to be stuck ordering far more components than the board actually needs.
I always feel anger or something when I see some YouTuber say they easily made a board and ordered it pre-assembled from JLCPCB. They make it sound like it's so painless, but for me it's mostly searching through part listings trying to find one without a minimum order quantity of like 100, because there are no filters or sorts for that