These are Additional 2nd tier email traffic sources and solo ad sources.
I have not used all of these sources personally.
Abel Chua http://www.abel-chua.com/solo-ads/
Alex Fields http://www.redpointprofits.com/solos/
Andrea Smith-Fulton http://smokinhotsolos.com/solo
Anthony Tilley http://www.anthonytilley.com/solomailings/
Ashley Gough http://ashleygough.com/soloads/
Atheer Fendi http://atheerfendi.com/solo-ads
Beatrice Brown http://bbprofits.com/Soloads
Bilaal Hussain http://www.internettrafficmethods4u.com
Brocha Weiss http://explosivetrafficvideos.com/solo_ads/
Cal Champlin http://www.calchamplin.com/solo_ads.html
Chris Jenkins http://onlinesuccesswithchris.com/soloads/
Colin Meunier http://www.colinmeunier.com/
Colm Wynne http://www.colmwynne.com/SoloAdSale/
Craig Raphael http://www.esourceinfo.com/advertising.html
Dean Miles http://www.dean-miles.com/soloads/
Dennis Pippen http://ads90.com
Emilis Strimaitis http://www.strimaitis.com/
Formidable Marketers http://formidablemarketers.com/solo-ads/
Frank Gang http://frankdang.com/soloads/
Frank Salinas htp://franksalinasonline.com/soloads/
Gary Baker http://opportunity-advisor.com/soloadbooking.html
Gedas http://www.solo-store.com
Gina Reedy http://book.safe-swaps.com/ginareedy
Heimir Finnson http://heimirfinnson.com/solo-ads/
Holly Sutton http://www.hollylorene.com/soloads/index.html
Igor Kheifets http://www.crossingthefreeline.com/soloads.html
James Neal http://realjamesneal.com/realqualitysolos/
Jayson Benoit http://jaysonbenoit.com/solo_ads/
Jeffery Baxter http://mastermindlistbuilding.com/soloads.html
John Cornetta http://www.soloads4sale.com
JT Martin http://jtlikes.com/soloads/
Kelvin Nikkel http://kelvinnikkel.com/soloads/
Kenneth Kraakstad http://kenneth-kraakstad.com/soloads.htm
Kevin Fahey http://isellsubs.com
Mark Gurney http://www.onlineprofitsinc.com/soloadinfo/
Mark Lyford http://lyfordmarketing.com
Natalia Piterova http://properebooks.com
Phil Springer http://rapidprofitplan.com
Phillip Brewer http://www.imspecialty.com/MySoloAdOffers/index.html
Randy Harris http://solosforsale.com/
Ray Johnson http://www.ray-johnson.co.uk/soloads
Rodger Hyatt http://www.rodgerhya.com/solo
Sean Story http://www.rapidsuccessformula.com/soloads.html
Steve Bermann http://singingsteve.com/solo.html
Steve Lorenzo http://ezinesoloads.net
Thomas Burke http://fasttrafficboosters.com/SoloAdMailings/
Vicki Nguyen http://www.thebestsoloads.com/vicki
Vince Craine http://vincecraine.com/solos/