Quite often, they can be found on ebay, in the used records section, along with inner and outer sleeves. There are a couple of different kinds, and they may offer more or lesser protection, and have different mailing weights. They commonly are about 50 cents each.
When I mail records, I use Postal Priority Mail, and they provide a free box. It is exactly the right size for a record, but you have to use filler, unless you are shipping about a dozen at a time.
When I mail records, I use Postal Priority Mail, and they provide a free box. It is exactly the right size for a record, but you have to use filler, unless you are shipping about a dozen at a time.