I bought 30 new record mailers last week for £10 including postage. It was a company called Sounds Wholesale. The phone number is 01283 566823 and the guys email address is: Matpriest@aol.com.
Ordered them on the phone and they came about 2 days later.
GRRRRRRRRR Just bought a load of them from somewhere else the other day!!! Didn't even think to ask on here Will know next time. Cheers for the info Am now in the process of increasing ebay p & p charges!!!