Yeah, these kinds of scams come in waves. I saw a bunch of them this week. Often, they're well-established accounts that have been hacked into to make them more convincing. Easiest tell is when they have large inventories, most of the items were added only recently, and/or most of what they're selling is priced much lower than everyone else.
Use the "Report this item" button/link in the listing. Then select, Listing practices, Fraudulent listing, You believe this listing may be fraudulent, and submit it.
When I see one, I usually check what else they're selling and submit fraud reports on several (or more if I'm feeling cranky
). If you're unsure about the typical pricing, you can often see other listings advertised on the item's page. I don't know why eBay doesn't algorithmically flag these already. Maybe they do and they're dog slow doing anything about them until people start submitting negative feedback.