I think I would choose a gift that would please your son. Tools, yard equipment, camping gear, something geared to his likes. I had two DD get married and one Son in law's parents gave a nice first anniversary gift, but no wedding gift. DH and I gave each girl a check for the amount we would pay for a wedding and it was their choice to have a fancy wedding or the money for something else (I wasn't about to plan a wedding to please them, I'd be disgusted with their nonsense within a week.) Oldest chose the fancy wedding, the youngest chose a new car for her and a new truck for the groom and got married at city hall with a reception at home. LOL