24-7Press Release is a press release distribution service that sends your news and announcements through a multi-channel distribution network to consumers, editors, journalists, bloggers, and websites.
Started in 2004, 24-7PressRelease.com has a database of over 60,000 members and has distributed over 100,000 press releases. They strive for excellence in providing publishers with a cost effective and affordable press release distribution service delivering compelling and newsworthy stories to the world.

I issued press releases through both 24-7 Press Release and PRWeb in the same week. The response from the PRWeb distribution was a bit better, but the cost was $200 vs $140 for 24-7. This service is not bad for the cost.