seriously take balls of foil and throw them in, it works the same, use 4 of them, they last for more than a few loads-i saw that on a frugal site, scoffed at it, then tried it when i ran out of dryer sheets and 'ate my words'!
I LOVE my dryer balls that i purchased for like $3.99 awhile back from The Christmas Tree Shop (for anyone who knows what store I am referring to!). They really do help keep wrinkles to a minimum and the clothes dry quicker too.
Rest in peace, Daddy. I love you.