After initially launching just a single bamboo wood back option for its Moto X handset, Motorola on Friday added three more choices and drastically cut the price. Instead of a $100 premium for the wooden case back, it’s just $25 starting today. On January 21, Moto Maker options will include walnut, teak and ebony choices as well. Motorola is also offering a $75 credit for early adopters who spend $100 on the bamboo model, notes Android Central. That credit can be used to order anything — presumably through the Google Play store — except for a Chromecast.