3 lb Sterilized Milo Grain Mushroom Spawn Bags in Unicorn Bags

Bagged in Unicorn Bags with stick on injection ports included 

Milo is a great grain of choice since it is really small, so you'll have more inoculation points per pound than rye. Quick colonization (couple of weeks or shorter depending of the environment provided) and it gets even faster since these bags are shakable.