There are hundreds of schools in the US you could get into if you have $50,000/year.
Most good schools will have good economics departments – but not all of them have business.
Below are a couple of lists of top undergraduate business programs. Many will be too expensive for you (costing $60,000+) but others will fit your criteria. Please note, that the tuition amount listed is just part of the costs – you need to go online and check COST OF ATTENDANCE for a more accurate estimate.
http://www.collegechoice.net/top-undergraduate-business-schools/
https://www.usnews.com/best-colleges/rankings/business
As you explore schools, ask yourself: what kind of a campus do I want - urban/suburban/rural? Big research university of smaller Liberal Arts College? Which part of the US?