I think order by price might be ordering by the lowest available price at time of index. This could be an out of date price if the index isn't updated when other pricing is updated. It almost certainly doesn't include shipping, as that can vary depending on where the item is and where you are so it can't be indexed. Filtering by seller doesn't change the sorting, in my experience, and I think neither does filtering by condition.
So, if someone is selling a used item in poor condition with maximum shipping, that product is going to sort as a low priced item.
At least, that's my reverse engineered understanding.
So, if someone is selling a used item in poor condition with maximum shipping, that product is going to sort as a low priced item.
At least, that's my reverse engineered understanding.