You don't need any insider spy service. In most cases the keyword planner is more than good enough to conduct a basic research. For the rare cases where it isn't you can use SEMRush.
Back in the day, these spy tools were somewhat important, but not anymore. Exact match keywords are not used so often, and even when they are, they don't perform as well as phrase and even broad.
Assuming you're using conversion tracking for up and down the funnel events, using less restrictive match types can work really well and prepare your account for scaling up later on.
