Save that money and market for 'free'.
Embrace online communities that might like your app. Market to them.
Use Twitter to spread the word. Tumblr is also a great place to help something go viral.
Embrace online communities that might like your app. Market to them.
Use Twitter to spread the word. Tumblr is also a great place to help something go viral.
Which might be a really great deal or not depending on how OP values their time.
Out of interest, how many hours would you expect to spend on this kind of project?