I wanted to try my hand at this but you need components to follow their book and their kits run out of stock for months at a time (and most years are out of stock indefinitely except for a few seconds before they get snapped up).
Buying all the components yourself separately would be a nightmare if not impossible
The author actually has put up a site that links to the kits. I just bought it and am about half way through the book. It's great!
The kit I got is from Chaney electronics. It is linked to from the site [1].
There's a more expensive kit from Makershed. The ones on Amazon are for the first edition of the book so don't get it there. Get it on Makershed's site. Again though it's more expensive by half.
I bought Make: Electronics in paper format and have had absolutely no trouble acquiring all the components separately.
The trick is to order from $0.99 Chinese eBay sellers and have patience to wait a few months for all the mail to arrive.
If you get something in bad shape, such as bent IC pins (or never get it, although that's quite rare) do NOT give negative feedback, instead contact the seller and they will gladly post another packet your way, so that they can get good feedback.
Of course, if you are in a hurry, there are lots of component shops that will sell you the same things for 10x the price and deliver them in a few days.
Buying all the components yourself separately would be a nightmare if not impossible