This is the "kit" I bought, instead of putting coffee grounds in the top and pouring hot water in it, I do the above and pour the coffee slurry into the strainer. But they do sell th strainer part separately (other brands to)

Easehold Pour Over Coffee Maker Drip Brewer Borosilicate Glass Carafe Permanent Reusable Metal Filters with Bonus Heat Resistant Silicone Mat(800ml)