Hydro Flask takes an extra 25% off select items as part of its Color Send Away Sale. (Note only items that are Mint, Flamingo, Blueberry, Lava, or Storm are included in this sale.) Plus, coupon code "BBFS1-X7KL1" bags free shipping. (Shipping typically starts at $4 for orders under $60.) That yields particularly strong and rare discounts on these items.
Before you spend another dollar on items and services like these, check with your public library. You will likely be surprised by what it offers for free.