I guess you can buy a kit if you don't have time and have the money to spend, but PF Tek is pretty straightforward. It isn't very difficult and you can buy everything you need, including spores, terrarium, jars, etc, for under $40. Here was my shopping list:
Kerr 8oz 1/2 pint canning jars - $10
Plantation Vermiculite - $5
Spore syringe from sporeworks.com -about $20 (not endorsing sporeworks, there are other legit vendors out there, just saying who I used)
brown rice - $1
perlite - $6
rubbermaid tub - about $10
ok, maybe that's a little more than $40, but most of the stuff can be used again and you will get more than one run out of a bag of verm and perlite. As long as you have a blender you can grind the rice yourself. Just work in small batches. A 1 lb bag is like a dollar and is more than enough for 10-12 cakes. I guess it's up to you. I never even looked into the kits because to me it was out of the question, so I don't even know how much they are or what kind of results you get.