I guess it depends on the provider, but the other day I signed up for a 30 day free trial with Now TV and I got 105 tokens. I also download free apps where possible. These are generated from the Facebook application. I haven't tried TapJoy yet. But now I'm in a similar situation as t0m because I don't know what to do with the tokens!
Personally, I'm planning to save them for stadium upgrades because they're probably most beneficial long-term and use remaining tokens on youth players rather than scouts. Haven't completely decided yet though.