Send them a classic thank you note card! Maybe include a lottery ticket, a coupon, or something specific to that agent that you remember them sharing with you. Their favorite....
Saying thank you for being so organized during our transaction, I thought of you when I saw this!
Tumblers and mugs make a great accessory that we could all use with that morning cup of joe. So many great Realtor®/Coffee things you can say in that card lol
Send them a sale pending sticker after you go into contract saying this is for your next one!
Listing Agent: Send the buyers agent a key tag for their clients and congratulate them on getting into contract! With a little "This is for when we CLOSE!" note.
You can never go wrong with a gift card