Minimum

Customized products require certain setups or mold charges that force us not to offer them in too few quantities.

Prices and minimums are shown at the bottom of item's description page. The smallest quantity shown is the minimum. 

Thus:

72-143 144-287 288-575 576+
2.29 1.99 1.75 1.55

means that the minimum is 72 pcs. and the price is 2.29 each at that quantity.