Need pop traffic source with carrier targeting

Hi guys,
I am promoting carrier billing offers following the method from amy and matuloo.
and I am making low XXX $ profits per day.
But I find it hard to scale to more profits as there are not much carrier traffic.
and I am using these traffic sources(I am promoting mostly mainstream offers)
popads
adcash
propellerads
selfadvertiser
wwwpromoter
zeropark
Can you suggest more traffic sources?
Thanks very much.

Xylon