Carrying/Transporting Trays For Plants (Scriven HG5)

Usually black in colour, these transporting trays come in various sizes - holds 8 pots - holds 12 pots and some hold up to 15 smaller pots. Square or round pot spaces so any size of tray, round or square spaces would be gratefully received. I would prefer to collect bulk rather than odd ones here and there as I am a carer for hubby and time, distance and quantity all come into play. I hope there is someone out there who would be glad to get rid of a quantity of these trays so please assist if you can. Thank you.