Thanks for the tips, everyone. I'll look into both the speeder and JW sets (JW would be best, as my son wouldn't care if he had 100 of each set, since they involve dinosaurs) to see what the reviews are like on them. I'd agree, other than the MF, which will be unique for rather obvious reasons if you saw the movie, the TFA sets are quite bland. The X-Wing and TIE look decent, but those two are reproduced so much, I just don't see them holding much value. And the MF is expensive as heck. Target and Wally World just don't have anything on clearance in my area.
I'll reconsider the Technic ones for him, but try to steer him towards the smaller ones at first. He also ran into the Nexo Knights the other day when shopping with his remaining birthday money, but found more JW stuff was in stock and it was all over.
Thanks for the help, everyone!