Ending today, Groupon offers the Osaka Glass Cold Brew Coffee Maker for $18.99 plus $3.99 for shipping. That's the lowest total price we could find by $7. It features a 1-liter capacity.
I hesitated since I had a bad experience with Groupon and did a quick search online just to check what's the price out there. Guess what I found? I got the same thing from Walmart @ $19.99 + free shipping! So just stay calm when you see deals seems good to catch, don't panic about the "ends today" magic word.