This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I used Enthuware's EJB Plus. I found it helpful and that it was harder than the actual exam. All simulators seem to have mistakes or vague questions but I still think they are worthwhile. EJB Plus is a lot cheaper than Whizlabs and Enthuware will give you two licenses to use the program at work and at home.