<p>Costco is running a promotion on decent Serta matresses, $100 off. However, they are still not what a college student would normally consider cheap: [mattress</a> at Costco](<a href=“http://www.costco.com/Browse/Product.aspx?Prodid=11237628&whse=BC&topnav=&browse=&lang=en-US&s=1]mattress”>http://www.costco.com/Browse/Product.aspx?Prodid=11237628&whse=BC&topnav=&browse=&lang=en-US&s=1). You can knock another $100 off the online price at your local warehouse, so the bottom line price becomes $450, not cheap but a decent deal for this type of mattress. Their delivery charge is very steep, $100, so you are better off renting a truck from Home Depot for $20 for 75 mins and pick it up yourself.</p>
<p>If your budget is more in the $200 range or below, I would try the Salvation Army, Goodwill, or another thrift store. Or you may check one of the constant “sales” at Sleep Country, Mattress Factory, or a similar store, where they sell low-end mismatched sets for around $100/piece.</p>