OWC, Macsales.com is a fairly large vendor that has been around for long time and does huge volumes. I donít think MP3CAR is really in their class yet.
Folks like OWC have special relationships with shippers to drive their shipping costs down. That said I went there and priced out a DVD-RW for shipping comparison, they were about the same as MP3CAR for most options. Overnight was cheaper.
I agree that they could drop that cable in an USPS express mail envelope and drive the cost down. Perhaps they could look into this as a shipping option for small items. I am sure that their catalog shipping works on flat rounded weights or something similar. Less than a pound might equal 1 pound or less on shipping.
I added to a shopping cart the P1900 and the cable kit. I found that their shipping was very reasonable, and that they had an option for USPS Priority. I was very pleased to see that. When I order my P1900 I will use that option. To get my goodies in 3 days or less for under $10.00 seems great to me.