Q.What does a compact composter/tumbler look like and where can I find in Omaha, NE? I have compost starter…
it is freezing cold now, but spring is coming…

Composting is really a good way to promote natural gardening. Like the NYmag, here is another article with pros and cons of good composter: https://homestuffpro.com/best-compost-tumbler-composter/

Good to think ahead! Spring is near. Compost is dear.
Here's what they look like:
https://www.google.com/search?q=compost+tumbler&tbm=isch&source=univ&sa=X&ved=2ahUKEwionYyv_6XgAhXMQY8KHQkHDUwQsAR6BAgDEAE&biw=1600&bih=782
Here's a review with prices of compost tumblers available on Amazon.com:
http://nymag.com/strategist/article/best-compost-tumblers.html
Here's how to make your own, and how to use one:
https://m.wikihow.com/Compost-in-a-Tumbler