Why do I get an error when I add items to my cart?

This is intentional; In-Stock items cannot be combined with [GB] or [Pre-Order] items.

Example: [GB] GMK Mizu and Krytox 205g0

Listings with a [GB] or [Pre-Order] are not able to be combined with other [GB] or [Pre-Order] listings.

Example 1: [GB] GMK Mizu and [GB] GMK Mizu desk mat

Example 2: [Pre-Order] GMK Minimal and [Pre-Order] GMK Redacted

Desk mats and keycaps are produced through different manufacturers. There will be a discrepancy on the arrival and completion, with desk mats finishing faster than keycaps. Rather than have them sit on shelves waiting for GB items to arrive, we prefer to have them on their way to you!