The first place I would check for funding to study abroad would be directly with your school. Many colleges have groups they tour with, and have scholarships available for the tour. If you have a Pell Grant, you can use that money towards your trip and studies as well. If your employer offers a form of tuition assistance, see if you can apply it to your trip. Many companies like to have employees that are well rounded and experienced, so you may be able to convince them to fund part (or even all!) of your trip.

List of aid specifically geared towards studying abroad:
Note that many times study abroad scholarships are designated for trips of at least one month, or even longer, so if you’re taking a short trip under a month long you may need to obtain alternative sources of funding.

IIEPASSPORT Study Abroad Funding - http://www.studyabroadfunding.org/
Earlier I mentioned the IIEPASSPORT page as a resource to find different study abroad programs. They also offer a tool to help you find funding for your trip, with a database of scholarships, fellowships, and grants.

Congress-Bundestag Youth Exchange for Young Professionals -http://www.cdsintl.org/fellowshipsabroad/cbyx.php/
This is a scholarship and trip built in to one, and definetly worth applying for. Check out the full information in my post on different travel/study programs.

Benjamin A Gilman International Scholarship - http://www.iie.org//Content/NavigationMenu/Programs7/Gilman_Awards/Home8/Home.htm
This program requires the study program to be in the same country for at least 28 days. You must be a US Citizen receiving a Pell Grant to be eligible for this scholarship, and must be in good academic standing. They award between 1,000 and 2,000 scholarships per year, of up to $5,000. In addition to this, they offer a $3,000 Critical Need Language Supplement to those who receive the scholarship.

Boren Awards for International Study - http://www.borenawards.org/boren_scholarship
Boren scholarships provides up to $20,000 in scholarships to study abroad. Note that these only apply to programs that are in countries deemed critical to US national security, and is funded by the National Security Education Program.