On https://www.minecraft.net/en-us/redeem under "REDEEM MINECRAFT: JAVA EDITION" has a section for purchasing cards. This section should be removed as these cards are no longer sold online or in retailers being replaced by Minecraft Java & Bedrock Edition bundle. Link "Buy Digital Gift" is linked to an Amazon listing that is no longer purchasable. 

Note: I think this information box is still useful if transferred underneath the new Java & Bedrock Edition bundle redemption box with updated links.