It was rumoured earlier this week, and after a bit of teasing from both the GOG and Konami Twitter accounts, a handful of Konami games have been released on GOG. This includes the original Metal Gear, Metal Gear Solid, Metal Gear Sold 2 Substance and Konami Collector’s Edition: Castlevania & Contra.
You can find all the games here. Their prices are:
https://twitter.com/GOGcom/status/1309477819261620225