Amazon.com: VIVO Electric Motor Sit Standing Height Adjustable Corner 3 Leg Desk Frame, Frame Only, Sit Stand Ergonomic L Frame, DESK-V133E : Office Products
BEKANT sit/stand underframe for table top, black, 63x311/2" - IKEA
OLOV Leg, adjustable, black - IKEA
LINNMON / OLOV desk, white/black, 393/8x235/8" - IKEA
KRILLE leg with caster, black, 271/2" - IKEA
Amazon.com: FLEXISPOT EN1S DIY Height Adjustable Desk Frame Electric Sit Stand Desk Base Home Office Stand up Desk Legs (Grey Frame Only) : Home & Kitchen