For what it's worth, price seems to be the stumbling block with most specialist dropshippers. The service I've read about on here so far, on average, looks to be pretty good. You can do better elsewhere, still dropshipping or similar, just not using those suppliers. Read around this section and the supplier discussion section to get some ideas and advice.
It's still worth signing up with those that don't charge a joining fee, though. Then you can take advantage of their special offers, or stuff that you don't really expect to sell but you have it available for eye-candy and padding on your site.