need insights on finding big cartons

In Portland OR there is a place called Carton Services which sells all kinds of boxes, both used and new. This included gaylords which are pallet sized boxes 4 or 5 feet tall. Good for shipping lots of terminals or printers (with appropriate packing). Look for someone selling used cartons in your area. They often sell bubble wrap and other packing materials. You will want to use doubleweight boxes if you are going to try to ship three tin CPUs in one box. I also recommend at least two inches of hard foam on the outside of the CPUs. I also echo looking at appliance and furniture stores. They have large sheets of cardboard along with leftover foam packing. I use the foam packing discarded by them to protect large items like CPUs. Often it is block and sheet hard foam. I cut it up with a kitchen serrated knife to fit the inside of the box. I have learned how to cut up all kinds of hard foam, including things like custom molded monitor inserts although I prefer sheet and block. I have also had to make my own double weight boxes for odd sized heavy items. I make a solid foam package (item & foam held together with tape) then roll it in large sheets of old appliance cardboard. You have to make each fold independently because each is a different size. Also as a result you need to cut the end flaps individually but it makes an exceptionally sturdy box end. You can make a very tight fitting box that way which survives shipping very well. Paxton -- Paxton Hoag Astoria, OR USA