A cheap truing stand from Nashbar or Performance Bike is very affordable -- with a discount coupon for either of these places, you can pick up the "Minoura" or "Spin Doctor" truing stand (they're identical) for a little over $30, and with a spoke wrench that comes out to roughly $40-something including shipping. With the stand and the spoke wrench, you can true your wheels anytime you want, rebuild them if necessary, or build your own that will be much sturdier and last much longer than the generic machine-made wheels you get with most bikes.

A wheel that you've put in the love and care to true yourself is a beautiful thing! Mine go out of true only once or twice a year and only if I hit a pothole or rode on the rim while the tire was flat.

Have fun!

-Kevin