Isn't part of the bbq experience having a long interesting conversation and making friends along the way? I'd much rather make a friend than spend time on the phone with nothing more invested than requesting a discount just because. I guess I'm old school like that.
After all, the minute something goes wrong with your smoker you'll be hoping whomever you called could remember your name.. and depending on them to go the extra mile for you.. just sayin. I personally despise being nickel and dimed... thats just me though.
BTW - ofc you'd be silly not to inquire about some sort of discount, but do it in person. Offer them some of your finished masterpieces in return. Thats my advice.