Don't just look for "mentors". Actually, look for mentors after peers.
One of the greatest (and easier) things I've ever done is establish a small group of like peers that meets regularly once a month, with the expressed purpose of experience sharing. Find up to 7-9 people in a company of similar size and age, but not necessarily in the same industry or market. What one person has solved will soon be your own issue, and vice versa. You can find these through contacts, LinkedIn groups (either established or start your own), and attending local seminars and meetings.
Mentors solved it all... a (possibly long) time ago. Peers have recently solved or are solving it now... but maybe incorrectly. Pick your poison! :)
PS: The reason the peering approach is much easier and more available is that the win-win is mutual and the same.