If you rarely need a lens hood, it hardly seems worth it to shell out the money for the few times a year when you need it. Print off a lens hood template and shield your lens on the cheap.
It isn't that lens hoods are shockingly expensive but if you hardly use one, you can probably find a better way to spend the $US15-35 a lens hood would set you back.
At Lenshoods.net you'll find lens hoods for lens of all brands and shapes. Whether you need a hood for a Canon prime, a Nikon telephoto or a Sigma macro lens you'll find that and more. Templates are available in PDF format and nearly every lens has a standard round hood and a petalled hood available.
The printing and fitting instructions are helpful — especially so if you're not usually one for paper craft DIY projects. They suggest using heavy card stock with a dark grey being ideal. If you're willing to invest a little more effort in the project you can use their template on a piece of black vinyl cover stock — visit your local copy shop to get a piece — for a more durable hood.
Check out the site below to see if they have a custom hood for your lens. If you have a crafty photography-related DIY project to share let's hear about it in the comments. Thanks Dante Franco Miranda!