we are having a hard time with this as well! I agree with Nadine...if it is too hard to bring it down either send it early in the mail, or take a picture to bring down with you.
I'm giving all my bridesmaids their gifts early as I have 10 and it will be impossible to bring all the stuff down with us.
Anyway, one gift we though of was a Flip Mino Camcorder...have you seen those? they are little pocket sized camcorders and you can get them for under $100 for the 30 minute versions..FI likes electronics and gadgets so this may be a good option for his guys.