We use our local post office to send our stuff out. UK post goes First Class Tracked and Signed For, anything else goes International Tracked & Signed when possible. We post on Mondays and Thursdays- UK stuff usually arrives within a day or two of posting and overseas stuff usually within a week.
Packaging- we use Jiffy padded bags which are made from recycled paper and contain no plastic at all. You can even re-use them if you want!
UK post is free on orders over £20 and overseas post is reduced by the same amount (£2.50).