I'd just be completely honest, I mean, this is your honey, right? I would choose a time when things are quiet and relaxed, like maybe at the end of a good day, and tell him something like -
"Something has been on my mind and I'd like to get your opinion. Have you ever noticed that your parents regularly give you hundreds of dollars worth of gifts, and they give DS hundreds, too, which means SO much to me, but when it comes to my gifts, well.... I get things like bandaids. Occasionally I get nothing at all. It's causing me to wonder if they're trying to send me some kind of message. I don't care about the 'stuff', but I do care about having a good relationship with them. What do you think?"
Then sit back and see what he has to say. Best wishes!!
I agree with this approach. I think if you care about DH and your marriage then you should be as open and honest as possible. Sometimes just talking something out helps. I personally wouldn't try any tactics like visiting your parents or being otherwise preoccupied when they visit. That just seems passive aggressive to me. My advice is: Don't fight fire with fire.