Unisub MDF Sheets Available?

[UK Printed Mugs]

Does anyone know if Unisub sell sheets of the MDF insert material that are used on their trays? We are going to create our own trays but would still like to use the Unisub material (which is super quality). We either buy the inserts (still quite expensive) or look to buy larger sheets of the same material and cut down. Thank you.