Recently, I have a bad experience with DeepdiscountDVD, but a good experience with Johnny Air.
I have made an order of 10 DVDs. Unfortunately, two DVDs are backorder and will be shipped 1 week later.
In order to fully utilise the courier charge with Johnny Air, I add another order of 4 DVD's and request DDD to ship together. At the end, they ship the two backorder items separately. So, all in all, there are four shipment (8 DVDs, 1 DVD, 1 DVD and 4 DVDs).
I send e-mail to Leiden to ask for consideration. She calls me up and tells me that they would charge me handling charge of US$5 only once, instead of US$5 handling charge for each shipment. So, I would save US$15, although they still have US$5.5 minimum one pound charge for each shipment.
Johnny Air has really good service, especially Leiden, super friendly. Highly recommended!