You can get a Omron CP1L-L14DR-A and CX Programmer version 7 for around $200. THis kit comes with programming guide and plc books .
You can buy a AB Micrologic PLC for around $150 you can download a trial version of software from AB's website. Make sure you use verify the version of micrologic PLC will work with the free software. A few questions to AB vie email or phone they should help.
I recommend learning AB first, its very common. Omron is unique
AB / Rockwell Automation is a great company!!
Yea AB/Rockwell is great but along with that comes the price tag.
Book wise check out "Programmable Controllers Theory and Implemantation"
by L.A. Bryan, E.A. Bryan. years ago when I decided this was the direction I wanted to go I found this book to be wonderful. It touches base on everything
AB / Rockwell Automation is a great company!!