Item 1, Yui660c, Aluminum Fc660c Case
Timestamp: https://imgur.com/a/z9khsZL
Typing Test: youtube.com/watch?v=QrK1BNWGwkY
Assembly Video: Yui660c Assembly Video, Custom Leopold Fc660c Topre Case 13.11.2020 - YouTube
Cost: 150 USD including worldwide shipping
Item 2, Yuikp 65% kit
Timestamp: https://imgur.com/a/hJDsrVg
Typing Test: Yuikp Flat Typing Test 12.9.2020 - YouTube
Details: Keyboard is flat, uses an integrated plate, anodizing grey color, laser engraving on bottom
Cost: 150 USD including worldwide shipping
Item 3, Yuikp 65% Assembled with Durock 55g linear
Timestamp: https://imgur.com/a/ktPK27Z
Typing Test: Yuikp Flat Typing Test 12.9.2020 - YouTube
Details: Keyboard is flat, uses an integrated plate, anodizing grey color, laser engraving on bottom, kbd67 pcb
Cost: 150 USD including worldwide shipping