These trays come in various sizes with pricing starting at £0.48 (incl VAT), £0.40 (excl VAT) for a 30mm x 30mm version.
Available with a 2mm or 3mm top layer.
The sizes listed are the internal slot size and 1-2mm is also added to these for tolerance. These trays come with a 5mm all round border lip.
Additional photos courtesy of Steve O’Connor in Australia.