Free 2-Liter Bottles of Pepsi - Many Walmart store have the 2-liter bottles of Pepsi priced as low as $1.00 each. Ibotta currently has this $1 cash back rebate offer valid on select sizes, including the 2-liter bottles, that will make them completely FREE! Limit 5! Only the single serve bottles are excluded. If you're not already an Ibotta member, sign up for FREE today and you'll get a $10 Welcome Bonus when you redeem your first offer. Score!