@S H You’re on the right track by securing your own ISBNs for the relaunch. If your imprint is US-based, Bowker ISBNs can be used for international distribution, including the UK, so you don’t need to purchase a separate Nielsen set just for that. Where I’d advise you to be careful is the KDP + IngramSpark setup. The ISBN itself isn’t the expensive mistake, the distribution structure is. Set up your imprint, ISBNs, editions, and distribution channels correctly from the beginning, and you’ll avoid unnecessary costs, conflicts, and headaches down the road. How are you currently planning to handle the publishing and distribution side of the relaunch?