When the word "number" and the number itself delineate an item in a list, it is best to write both of them out to avoid some confusing situations.
...They were, number one, $243; number two, $867; and, number three, $674.
...They were, No. 1, $243; No. 2, $867; and, No. 3, $674.
The second one is just not easy to read. For that reason, I think it is best to follow the example in the first sentence and simply make that the standard.
Happy punctuating!
Margie