I did some research on types of metal and found hollow welding tubes, and thought those would make the perfect garden stakes.
Square Welding Tube (3ft. x 1/2") @ $5 each
Hack saw with metal-cutting blade @ $10
Clamps or extra set of hands
Medium Grit Sandpaper @ $2/pack
Metal Stamps in font of your choice @ $20
Black Permanent Marker
Scrap Cloth or Paper Towel
Full tutorial and other information can be found here: http://rhodylife.blogspot.com/2013/04/garden-markers.html
Step 1: Cutting and Sanding the Welding Tubes
Take your bow saw, with the metal-cutting blade, and cut the welding tubes to the length that you desire. I cut mine to 8" each, giving you about 2" below soil, and 6" above, which should be perfect once the plants are grown in.
If the blade of your hack saw made the ends of your welding tubes really rough, you can use some medium grit sandpaper to get rid of the sharp pieces, making it a little more smooth.