These are just two options I found…

Here is a very economical stove top espresso maker. You can use your own beans and it is available in many sizes:

Amazon.com: Bialetti 6-Cup Stovetop Espresso Maker: Stovetop Espresso Pots: Kitchen & Dining

Here's a little machine that can brew ground beans or pods:

De'Longhi Retro BAR32 Espresso/Cappuccino Machine - BedBathandBeyond.com