Your parents have probably been the most supportive people during the wedding process, so you should definitely get them a gift. Here's some great ideas.
Under $25
Father of the Bride/Groom cufflinks from David's Bridal -- $16
Under $50
Mother's Memory Box from David's Bridal -- $35
Lenox True Love Invitation Frame from David's Bridal -- $43
Under $100
Precious Moments Figurine -- $55
Wedding Album from Mpix -- $80 - $300 (I have not ordered from them, but have heard from friends the albums are good.)
Under $25
Father of the Bride/Groom cufflinks from David's Bridal -- $16
Under $50
Mother's Memory Box from David's Bridal -- $35
Lenox True Love Invitation Frame from David's Bridal -- $43
Under $100
Precious Moments Figurine -- $55
Wedding Album from Mpix -- $80 - $300 (I have not ordered from them, but have heard from friends the albums are good.)