I think Your Safelist

YourSafelist dot net is a great site.  They offer a one time upgrade fee. 
I upgraded because it's worth it for the extra mailing credits and referral credits. 
This keeps me mailing out my opportunities to people.  You get 5000 credits every time you refer someone.  Plus there's many added benefits to YourSafelist.  Payouts are at $20 and commissions are calculated every Friday.  They pay through Pay Pal and Alert Pay.  There's three membership levels and I enjoy using the site. 
I hope you will too.  http://yoursafelist.net/s.php?lauraj1