If you are sure you will never need to turn in reverse (sometimes reverse can help with sanding challenging grain) and you can tolerate a little lack of concentricity then pin chucks (aka the Craft Supply Closed End Mandrel) are a viable choice.
As Monty pointed out, you can make one yourself if you like making your own tools (or you have more time than money). But for $15 and the amount of time / effort involved in making one by hand (without a mill / metal lathe) I would make a slimline to sell to someone for $20 to pay for a pin chuck. But that's just me.
I prefer the closed end mandrels from Arizona Silhouette. More money, but they meet my needs better. Holds in forward or reverse. Concentricity is very good. They can sometimes be a little fussy to tighten up, but once tight they stay tight.
Ed