Guitar Center cuts up to 40% off select musical instruments, audio equipment, and more as part of its President's Day Sale. Plus, take an extra 15% off one qualifying item priced $199 or more via coupon code "PRES15". (A $500 maximum discount applies.) Shipping starts at $4.99, or get free shipping on orders of $25 or more. (You can also opt for free ship-to-store pickup.) Deal ends February 19.