Diana Gabaldon Lord John Series

[agr8lemon]

I would LOVE to find the whole series, however finding them one at a time would be great as well. Here's the link to the amazon page with them:
https://www.amazon.com/Gabaldon-Complete-Brotherhood-Scottich-Outlander/dp/B00N26DWEU/ref=sr_1_6?ie=UTF8&qid=1479926970&sr=8-6&keywords=lord+john+grey+series

The titles are as follows:
Lord John and the Private Matter
The Brotherhood of the Blade
The Hand of the Devil
The Scottich Prisoner

Any help on this would be GREAT! Thanks.