Ekena Millwork CORW03X04X07ACAL Small Acanthus Wood Corbels, 3 1/2"W x 4"D x 7"H, Alder

Can I use them as bookends? Are they heavy enough?

can these be cut?

Is the price a mistake? I am potentially interested in this product at less than $50, not at that incredibly ridiculous price.

Can these be used for an outside fireplace?