Building one yourself can be another great option. I'm slowly building my first AR this way. There are many parts manufacturers out there who are friendly to the left, or at least politically neutral, more every day.

The build process will get you VERY familiar with how your firearm and each part of it functions, there is a build for every budget and (at least with the AR platform) you can customize it to your heart's content.

Plus it's just a lot of fun to see it come together, it teaches self-sufficiency and you end up with a basic kit of tools that can come in handy in the future. IMO it is very worth the time and effort as opposed to just buying something already built off the shelf.