It's hard to say when the Barnes and Noble manga sale occurs. Sometimes it's announced on their social media or in-store flyers. Keep an eye out for those!
Specialized manga websites or forums dedicated to manga enthusiasts might have listings or recommendations for where to purchase 'A Lull in the Sea' manga. You could also ask for suggestions from fellow manga lovers on such platforms.
I don't know where the physical book of " Parents 'Love " is sold, but you can buy the electronic version online or ask your local bookstore if there is a physical book for sale. Before purchasing, it is recommended to confirm the copyright of the book to avoid any copyright issues.
I'm not sure which specific 'Sale Pelletier Love Story' you are referring to. There could be many people named Sale and Pelletier. Maybe it's a story within a particular community, family or a work of fiction that I'm not familiar with.
I'm not entirely sure as it could be various things. It might be a side story related to a story about love that is somehow for sale, perhaps a relationship that has a transactional aspect to it in the context of the story.