So Amazon has the .5mm currently on sale for $3.99 a pencil. That's from Amazon directly as well, not an independent vendor, with free shipping: https://www.amazon.com/Pentel-GraphGear-Automatic-Drafting-PG525A/dp/B0006HXQXA
If you only need that thickness of graphite it's a way better deal; however if you need more than one of another size, the four pack here is a pretty good deal.
If you only need that thickness of graphite it's a way better deal; however if you need more than one of another size, the four pack here is a pretty good deal.