Yes, Bookbyte.com does offer site-wide discount codes. One can look on Goodshop for coupons to apply to Bookbyte.com, including 30% off sitewide, free shipping, 30% off select items, and donations. Bookbyte.com advertises their special discounts and offers on their website, social media, and mailing lists. So, it's recommended to check these places to get started on using Bookbyte.com coupons. Also, there was a sale offering 20% off sitewide with the code “mother” during a weekend. However, please note that these codes may have expired and it's always a good idea to check for the latest ones.