@cjwest10 I haven’t heard it personally, but recently Monoprice has really been well received for their price. It might be worth trying out.
If you are interested in a cheap budget DIY sub, you can do two 10″ GRS subs in an isobaric configuration to get you a good response down to 20hz. You could pair it with any amp from 250-500w, like the Yung 500w. The disadvantage of something like this, is it would be bigger.