Salesman Isekai'ed with Item Shop: A Portal Fantasy (Isakei'ed Salesman Book 1)

What can a merchant do with an Item Shop skill in a fantasy world?
When Hermes pulls a printer ink cartridge salesman into another realm with cheat skills but no mission to save the world, Owen Solo knows it is too good to be true. But no worries, this ace salesman exploits his Item Shop skill to survive and thrive in the capital city of Midglen, slowly becoming a power by himself. Noble intrigue, deadly disease, assassination attempts, and monster hunts? Bring it on!
Warning triggers: this 120k words litrpg, harem, and portal fantasy novel contains cursing, adult encounters, gun violence, domestic terrorism, tobacco use, and other scenes that some folks may find objectionable. Hence, this book is suitable for a mature readership.