If you have a $5k or so budget and your product appeals to a more general audience, you will definitely get 1000 users by sponsoring the Epic Privacy Browser...

If you have a $5k or so budget and your product appeals to a more general audience, you will definitely get 1000 users by sponsoring the Epic Privacy Browser...they have a high visibility sponsorship that reaches a few hundred thousand users...so any general service will get at least a few thousand people to try a service (actual numbers will depend on whether your service is general or niche, etc.).