DS will be 7 this fall and is a huge
lego fan. There are sets in every price range and so many differnt themes. He loves the star wars ones. We have so many wii games that I try to avoid buying more of those. He likes the Mario ones and yes, the Lego ones the best.
Others things he really likes and enjoys:
Nerf Anything. Again, every price range. Don't buy off name brands.They don't work well.
Board Games- Monopoly (many different theme ones including Disney!, Sorry, Pay Day.
Sports equipment- He has done soccer, does base ball, and just discovered tennis. Academy Sports has some Jr rackets and balls well under your price range. Just be sure he has somewhere to play.
Ok, so our 6 year old thinks he is a teen, but he loves itune cards, fast food gift cards ( a rare treat for us), an arcade gift card, go-cart gift cards, movie gift cards!