Each box of these contains 30 shields in a slight-crescent shape to fit perfectly under the eyes. The box of 30 retails for $9.99, which I think is fairly affordable.
The shields themselves have a cotton-pad like texture, but are very thin (as opposed to a fluffy cotton pad). Perfect for catching fallout.
As you can see below, the back of each shield is entirely adhesive, and has different strips so you can choose how much adhesion you use. I've found I only need to use the top two little corners for a good hold on my skin, but you can peel off whichever parts you like!
To conserve these, I like to use one under one eye, then use that same shield under the other eye as well. The adhesion is pretty strong, so I can easily get multiple sticks out of it.
Pretty cool, huh? You can find these on several beauty websites, as well as ShadowShields.com and Amazon. I think this is especially perfect for any makeup artists out there to use on clients... a little more professional than something like tape!