The First Years spill-proof straw cups are included in a promotion at Target through 1/5. Buy one sippy cup product and get a second one for 50% off. These spill-proof cups come in a pack of four and are on sale for $2.00, down from $2.99. Buy two 4-packs for $3.00 (one will be half-price), which makes each cup only thirty-eight cents! Check it out:

Buy 2 The First Years Straw Cups, 4 pk $2.00, sale price through 1/5
Buy 1 Select Sippy Cup, Get 1 50% Off through 1/5
Final Price: $1.50 each, or $0.38 per cup