There's plenty of reputable spore vendors if you poke around on shroomery.org. I have used little shop of spores many times and always got my order shipped quickly.
Don't buy a "kit." To start off with the PF tek method all you need is a pressure cooker, some 1/2 pint canning jars, brown rice flour, and vermiculite. After the jars are done colonizing you'll need a small clear tote bin, a drill, and some perlite to make a shotgun chamber for fruiting. You can use a single 6500k cfl for lighting with a timer but even that is optional; a room with a sunny window will also work.