Ask HN: Are there better options than PR Web out there?

I'm trying to increase my SEO so I wanted to start using a PR service that could help and I'm wondering if anyone has any thoughts and/or recommendations if whether PR Web is the best way to go or if there are competitor sites out there that are as efficient at a better cost. I know you got to spend money to make money but with their prices ranging from 80 - 360 USD per press release, it could really ad up. Especially because I'm in the ticket domain (www.tickettrunk.com) so I'll need to do it several times.

Thanks!