Cards are now priced based on the highest resolution possible made for such card.
All cards made in 3K reflect that price.
All cards made in 1080p but not 3K reflect that price.
All cards made in 720p but not higher reflect that price.
Some older 720p cards were redone in 1080p, so these will now cost more.
However, discounts make it possible for cheaper prices, based on user level (gold, platinum, diamond, etc.). The higher the user level, the greater the discount.
Plus, new cards are even cheaper for the first seven days.
Top screenshot shows the discount levels and benefits.
Middle screenshot shows one of Marta's cards. See the upper right corner where it says 'full HD 1080p'?
Bottom screenshot shows one of Marta's cards. See the upper right corner where it says 'HD ready 720p'?