Get a Free Tree to Tub Shampoo & Conditioner Set After Rebate! To get this, click on the “Get Offer” button the Facebook post. Then, follow the prompts in Facebook messenger. You’ll need to buy the product Amazon, then provide your order number and PayPal email to Tree to Tub. They’ll send your rebate within 48 hours after your order ships – making it 100% free after rebate!