Popular Mechanics homemade solar cooker

This solar cooker is built out of plywood, foam, drywall and foil.  It would be a great choice for a low cost solar cooker.

http://www.popularmechanics.com/home/how-to-plans/woodworking/who-needs-a-grill-build-a-hot-box-solar-oven

Homemade solar oven options

This site has many different style homemade solar cookers. Each design has a picture so you can see what it looks like and the information you will need to build each one.  This is a great reference site.

http://solarcooking.org/plans/

Solar cooking using the Sun Oven

The Sun Oven can be purchased pre-made at this site.

SUN OVENS® enable the sun to bake, boil and steam food while enhancing the tastebenefitting the environment and beingprepared for an emergency
http://www.sunoven.com/

Solar Powered Lamps--one example

The Nokero N220 is a very bright, all-in-one solar LED light that fits in the palm of your hand. Its lead-free rechargeable, recyclable batteries are powered by the world’s most efficient commercially-available solar panel.

The Nokero N220 is bright enough to replace most traditional electric lights, and is a useful light in the home or workplace. Use it to light your patio, garden, or walkway. Charge it by day and use it indoors as night.

The N100 is Nokero's iconic product - and its first. Conceived of on January 24, 2010, and launched June 10 of 2010, the N100 bulb combines the best in solar and LED technology to create a superior, yet affordable, solar light.

It's made to last. The clear globe is made from the same shatter-resistant polycarbonate used in car headlights, and its high-temperature battery ensures it will charge efficiently even in the world's hottest weather. 

There are many different makers of solar powered lamps.  Research them and see which one would fill your needs the best.

http://www.nokero.com/products/n220-solar-light-bulb