I have three different roasters, and I'd pick Ambex. But we're off topic here...for home roasting I'd steer clear of popcorn poppers and trying to roast in a microwave oven. That just won't do.
The best of the home roasters typically does enough for one pot of coffee (I-roast or Zach & Dani, for example). Consider alternatives...
You might look at the spit-mounted roaster attachment for your backyard grill. It's a drum roaster of sorts and uses the heat from a gas grill. The only problem I see with that is when your Kenya tastes like beef or chicken - be sure to use a clean grill. If you're that dedicated to home roasting, dedicate a gas grill to the task and never use it for burgers & dogs.
Or, you could go with one of the modified "set it & forget it" ovens. I've seen them on eBay. AeroRoast, Micro TostaCaffe, and JavaPro-CRC are in that class. Expect to pay a few hundred.
I have not tried these products and do not endorse them. I can only tell you what some of my customers have tried, most end up buying my roasted coffee in the end. (Hey, I have great coffee, can't blame them!)
By the way, none of these would work as a "get rich quick" to start a coffee shop. These are only good for home entertainment and the quality of the end product is not what you'd call professional. But it's fun and you learn a lot about coffee.
-"BG"