Local libraries sometimes carry light novels. You could also check specialized bookshops that focus on fantasy or manga. Another option is to look for them on websites dedicated to light novels.
You can try buying them from online bookstores or visiting local libraries. Sometimes, you might find some free ones on certain websites, but be careful about the legality.
You could also work in the publishing industry related to light novels. For example, as an editor or marketer. In this way, you get paid in yen for your contribution to the light novels' success.
Sure. A lot of light novels are made into audiobooks. It's a great way to consume these stories, especially for those with busy schedules or for people who like to multitask. Some light novels have really engaging narrators in their audiobook versions, which can enhance the overall experience of the story.
Check out second-hand bookstores or online marketplaces. You might find used light novels at lower prices. Also, keep an eye on special promotions during holiday seasons.