It depend on what product you keen in selling. Now i'm using http://www.zippypress.com/DropShipping.aspx Their price is competative Do try it coz now they have offer free trial
www.Eyefive.com for "herbal remedies" and what not. Used them many moons ago, haven't been to their site in about 4 years but I see that it's still listed in google, so go for it.
You can check this list of 100's of Free Drop Shippers and other helpful goodies. I've been seriously thinking about starting a small dropshipping company.