You say to them... "Could I get ya number for nxt time please" and they will most likely say yes... especially if you are getting a big amount... It's not hard, and they aren't going to kick the shit out of you for asking... Believe it or not, they will most probably say sure and give it you... Remember, dealers have a specific number for dealing, so if they don't want you to ring them, theyll turn that phone off...