Mobile Ad Networks for less than $50?

Does anyone know platforms that allow you to sign up and deposit a campaign for under $50?

i haven't seen a mobile ad self serve platform that had a minimum buy? the only drawback is some ad servers algorithms will penalize you for having a low budget in your account. You can definitely deposit $50 in jumptap, mmedia, airpush, etc...

However with so low budget the campaing will not be very efficient, don't you think?

Try Tapgage and buzzcity

or

Just register each one that been shared here http://www.blackhatworld.com/blackhat-seo/mobile-marketing/606576-get-400-international-mobile-ad-network-listing.html

You should try Adtwirl.com !

I have never used them, try reading reviews on google for that company before using them..

From my personal experience you can never get premium/unsold inventory for $50.
Neither can we do any kind of testing as there is a fact that around 50% are accidental clicks.So you've got only $25 left to test and you can't get enough data to test a camapign for $25.
btw buzzcity has quality traffic in ONLY Asian region don't go for EU or West side. It just wont convert.I am saying this from my experience.
GL

ps: I am not saying that you cant get any return on $50.Just do some research, search new ad networks where CPC rates are/will be relatively low as there is little to no competetion.But don't go for big networks like mmedia,inmobi,Admob etc, you will burn $50 up in no time and also be very very less conversions.

does any body know if there mobile ad network or other media buy that giving
free trial .....even10$