I use to use Thumbtack when I first started my business. Generated a lot of leads for me at a REASONABLE price! Note the REASONABLE price part in that sentence!
Now they are charging upwards of $30 if someone even responds to a quote. You may not get the job, may not even hear from the people again, but still are charge an exorbitant amount. And the manner in which they do the billing and setup is shady.