While on the care and feeding of vendor reps, don't forget your manners. Offer to pick them up from and return them to the airport. Ask if they want to join you for dinner prior to the meeting. Invite them to any gatherings your members have after the meeting. They may not accept but they will remember.
Many groups provide a small gift.
A coffee cup with the club logo or some other remembrance. If you cannot attend Comdex, try attending local computer events and bring business cards. Talk to vendors there. All of these can be good sources of vendor speakers. There will be a copy of the proceedings for the last several Comdex events.