Best place to get crush washers in bulk/cheaper?

I’m getting the materials together to start doing my own minor maintenance again now that it’s not so cold out (no garage makes it difficult in the winter), and the current roster includes an oil change this week and an ATF drain and fill in the near future. I know I need crush washers for both drain plugs, and I feel like every successful mechanic I see, especially for Honda, just has an assortment of them ready to go. Is there a way that I haven’t seen to get them in bulk, or at least at a lower price? My local auto parts store is charging $15 for one engine oil drain plug washer and $18 for one transmission drain plug washer and that feels… steep. Especially considering how relatively inexpensive everything else about an oil change is. Am I missing something, or is this just something I’d better get used to?