My husband is making a cabinet for my new Bernina 880 that weighs 37 pounds. He spent a week tracking down a place that sold lifts for the heavier machines.
He purchased a lift to accommodate up to 75 pounds from Sewingmachineoutlet.com. It's advertised at $550 + $50 for auto stop, but the actual purchase price was $539 with shipping.
The lift was shipped from Fashion Cabinets in Iowa.
My lqs warned that a lesser lift would not hold up with a heavy machine and the machine would eventually start to sink into the cabinet. The lift in my older cabinet was around $250-$300 and it was advised against putting it in the new cabinet due to machine weight.
Hope this helps you.