The Inevitable Santa Question Dodged - For Now!

Trevor is 7. Amy is 5. It was bound to come up eventually.
We're in the van on our way to pick up a couple of friends for a playdate. The subject of toys comes up...

Me: We're going to go to Toys R Us later to pick up a couple more low booster seats for the van.
Trevor: But we're not getting any more toys right? 'Cuz we already have too many, right? (hoping beyond hope that I'll disagree with him)
Amy: Yeah, but Santa has to bring us toys, right Mommy? Right?
Me: Uh huh, but Christmas is still a long way away.
Trevor: Santa isn't even real, Amy.
Me: <holding my breath, waiting to see where this goes...>
Amy: What? Yes he is.
Trevor: No he isn't. He's....a ghost.
Me: <exhaling quietly>
Amy: What?! Then what about when we saw him at the golf club last year. Remember, he brought me that fluffy puppy in the purse? Right, Mommy? Remember?
Me: That's right, Aim.
Trevor: That was just a man in a costume.
Me: <taking a deep breath> Well, at that time of year the real Santa is super busy at the North Pole getting ready for Christmas Eve. So he has helper Santas who look like him all over the place. Like at all the malls. <Trevor looks a little relieved to hear this.>
Amy: But how do they get the toys before Christmas?
Me: <getting in deeper, trying to be vague on the details with my child who never forgets ANYTHING!> Well, he sends them.
Amy: Like how, in the mail?
Me: Well...
Trevor: Well, he's magic, Amy. That's how. <So much for the non-believer.>
Me: So, what do you guys want to play with Maddie and Sydney? <trying to steer the conversation away before we pick them up and they undo whatever Santa stories their mom has told them...>

So, how have you handled the Santa question at your house? I wasn't expecting to have to deal with it in the middle of August!!