Yup, card Hoarders!
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Aaaaand 3 bad santas. Yay camping! :D
Hi, Khalleesi. I ran into this exact problem back in the day. The best thing you can do is check as often as you can with the Merchant. That being said, don't just explore the listings. You want to search for the card by name and then attempt to buy it right there. If the merchant is sold out of the card, it will tell you the card is unavailable. At that point just swallow your sadness and wait to try again later. Repeat this, and you'll get the cards you're looking for eventually. Be prepared to shell out some gold though, Bad Santa will not be cheap if it's scarce. You want to buy 3 or 4 so that you're prepared to make most decks, and that will end up costing you between 1100-1600+ Gold depending on where the price is set and how many you buy.
Another thing to consider while waiting for Bad Santa to appear is alternative draw engines to tide you over until a later date. Sacrificial Lamb is great in Shadow decks, there's also Tome of Knowledge for Mages, Ill-Gotten Gains for Rogues, Blood Moon for Wulvens, Antimatter for Elementals, Blood Frenzy for Warriors, Hunter's Gambit for Hunters, etc. There's also other draw cards like Word of the Profit, which a lot of people love, Loom of Fate, Crystal Shards, as well as alternative draw engines like giving Shadow Allies Bloodthirsty or using the Human Ally Tainted Oracle or the Shadow Ally Falseblood Cultist. You have a wealth of options when it comes to draw engines, and you'll find some that fit your play style. Some of these will be better for you than Bad Santa anyway, because many of these don't give your opponent cards the way Santa and Bazaar do. Just explore your options and keep playing!