My girlfriend and I are putting together a party for her birthday, and I'm organizing and paying for the meal, which is being supplied by some old friends of hers who have a catering business. Here's the thing: After I contacted them about our plans/needs, they provided me with a quote that includes a 'friend/birthday discount', but I feel a little funny about that, since I'll be the one paying for it, not her, and I don't even know them. (Am I being neurotic?) At first, I figured I could just give the discount back to them in in an extra generous tip, but given their friendship with her, I'm afraid they might be offended by/refuse a tip entirely (they're invited to the party, BTW, FWIW). I don't know that they would have offered the discount if they'd known up front that it was going to be on my dime, but on the other hand, I don't want to put them on the spot now by making that explicit. Their catering business is pretty popular and successful and all that, but I doubt they're rolling in dough, so I just want to be fair. Am I worrying about it too much? Gift horse in the mouth and all that? What do you think?