i always charge under £3 for 1st class recorded uk, and this regulary consists of 1 brand new quality mailer. 1 new white paper sleve, often plastic or pvc cover, 2/3 stiffners 2 elastic bands, and fragile taped seal, costs about a quid, and just work it into the sale price of the record.,cant beleive how some people send expensive records in paper packets with cornflake stiffners etc, bought a record last year for £100 and it came in just a old battered mailer with No stiffners at all.