The Marston Series eBooks are available exclusively on Amazon. The paperbacks are available on Amazon and Barnes and Noble.
If you are a Kindle Unlimited member, you’re in luck. The books are in the Kindle Unlimited program. If you don’t have a membership, no worries. It’s free for a thirty-day trial membership.
Amazon is running a bulk sale on the first four books in the series for a limited time. No one knows how long this sale will last, except Amazon, so if you’re interested, grab them quickly