So I ordered my toppers from intellibed but they no longer list their toppers on their website. I talked to a mattress enthusiast not long ago and you can still buy it from them over the phone, but keep in mind they only have that 4x4 buckling gel component in the middle so you need more than one if you wish to cover your bed with buckling gel.

In a different life I'd consider setting up a buckling column gel manufacturing station and just sell people custom sized buckling column gel sheets.