Eye-rolling at a different Game of Thrones collaboration each day? Us too. As we approach the eighth and final season of the HBO fantasy drama, more and more cobranded products are landing with a thud.

Thankfully, Diageo is doing it right.

Earlier this year, they released a special edition set of Scotch whiskies matching powerful Westerosi houses and the Night's Watch with various elixirs in their portfolio.

• House Stark – Dalwhinnie Winter’s Frost
• House Tully – Singleton of Glendullan Select
• House Targaryen – Cardhu Gold Reserve
• House Lannister – Lagavulin 9-Year-Old
• House Tyrell – Clynelish Reserve
• House Greyjoy – Talisker Select Reserve
• House Baratheon – Royal Lochnagar 12-Year-Old
• The Night’s Watch – Oban Bay Reserve

But here's where things get really interesting: they're nearly impossible to find and skyrocketing in price on the third party market.

Popular bottles like House Lannister (Lagavulin 9-Year-Old) have already doubled in price while House Baratheon (Royal Lochnagar 12-Year-Old) has already tripled. The Night's Watch (Oban Bay Reserve) is the hardest to find, thanks in part to stealthy blacked-out bottle, and will set you back nearly $500 to order online from an unofficial distributor. The complete set of seven will cost you a minimum of $2,500 and is only going up.

So what's the play? If you're willing to go on the hunt, a quality liquor and wine store in your area might have a few bottles of the easiest to find collaborative bottles like House Tully (Singleton of Glendullan Select) or House Stark (Dalwhinnie Winter’s Frost). Otherwise, you'll have to pay a premium at an online retailer. Godspeed!