The Fireflies ones have appeared elsewhere but with a cost about 4x that of Fireflies. Another one I’ve seen at Banggood has the half-tube on the other side, the bottom. $9. Looks fairly well made and eliminates the button/no-button top issue. I know what you mean, about those drill bit holders. Will have to check that out. Heck, if buying a drill bit WITH the tube that works is cheaper than $9, worth it to go that route.
That certainly works, though not elegant. Considering cardboard, yeah—cereal boxes can be very good. Especially if you order one of those jumbo boxes that uses slightly thicker material. I buy Nature’s Path cereal all the time and save the cardboard for packing material when shipping things in bubblewrap mailers. I was thinking… of just taking that, rolling into a tube, and secure with some tape having adhesive that won’t ooze out.
The Fenix ALF-18 looks decent. Battery Junction has them for $5.99… but I think shipping minimum with them is usually $8.