We have the first instance of Traders Tender in the Battle.net shop. Blizzard did say that the Tender wouldn’t be in the shop by itself, but would arrive included in bundles. And today it has.
You can get 200 Tender as well as two wrist transmogs in the Corsage Pack for 5 dollars/euro. The transmogs themselves will also be available in the Trading Post later on, but after they leave the shop, as this is a limited time offer.
And here’s the official description, with some additional details:
The Corsage Pack (Source)
No matter where you take your adventures in Azeroth, you can let your personal style bloom with the perfect wrist accessories for any occasion. Stand out with a delicate red-bloom corsage or let the mood take a dramatic turn with a brooding black blossom. You’ll be the center of attention at every social gathering.
In addition, take an extra 200 Traders Tender with you when you visit the Trading Post.
Pack available in the Battle.net Shop for a limited time*. The Fanciful Corsage and Gothic Corsage will arrive in a future rotation of the Trading Post, but no sooner than three months after the pack leaves the Shop.