The trick to making money in sales is to keep costs low by finding things to sell that are inexpensive yet in demand. One way to do this is to sell books online through book-selling websites. Books, such as classic novels, sell quickly because they are in great demand. Find inexpensive used classics novels from yard sales, library book sales or used book stores. If you don't want to sell actual products, sell ad space instead. Many companies will pay you money to place their ads on your car so you can advertise their company as you drive around.
Earn money for your opinion by taking online surveys or participating in focus groups. Research reputable websites that allow you to sign up and get paid to take surveys. The websites pay a small amount for each survey and they require that you provide them with a mailing address and email address so potential advertisers can send you information. Focus groups are planned group discussions where market researchers pay individuals to give opinions or ideas on products, services, concepts or marketing ideas. Focus groups looking for participants can often be found online.
For people with writing skills, freelancing your talent online is another way to make extra cash for college. Website creators are constantly looking for new content that draws traffic to their sites. Many websites pay writers to produce articles on popular topics for publication on their sites. If you don't want to write for someone else's site, set up your own site and start a blog. The trick to making money blogging is to pick a popular subject and write engaging posts that attract traffic to the site. Once a blog becomes popular, the blogger can make money by posting pay-per-click ads on the site or finding advertisers that pay to post ads on the blog.
Other unique way to make extra money for college involves selling your services. Nude modeling for college art classes pays well, has flexible hours and the only actual work involved requires sitting or posing for a short period of time. For students who excel in certain subjects, tutoring also has flexible hours and decent pay. People who aren't afraid of needles and are in good health can donate blood or plasma to a plasma center or blood bank for money. The donations only take a few hours, you're paid in cash and the plasma center and blood banks let you donate at least a couple of times a month, which can quickly add up.