once the pre rut starts which is soon after the bucks shed velvet you can start using the grunt call to help bring in deer
I have never used a doe bleat and have never heard of such a thing as a "social call" because grunting has worked for me
My deer season doesn't start until Oct. 1 so usualy by then the pre rut has started to slowly swing into action and most deer will react to the grunt call if they can hear it and will come in to investigate who is in the area
But also $25-30 seems extremely high i just bought a new primos grunt call which has a nice deep mellow grunt and it only cost $10.00 with sales tax and i think that a good grunt call would be all you need before the rut starts to come into swing