I have the IPO implement authorizations w/CCC, and the ACA. I never took a course or a workshop. I studied the documentation, played with an IPO for a few hours. I went to Avaya university, and took the assesments, which test you out of the courses. The ACA takes another test, third party testing facility.
It can be done, but it will still take the equivalent time, but it can be done independently. I would at least get a hold of a small office edition for them to put on the bench to play with. With out the class, do not expect them to be fully knowledgable, and the implement credential is just the begining, there are many more courses which deal with the other IPO applications. It prepares you to install an IPO as a traditional system only. There is a VM Pro class online for less than $200.
Also, pay them to study, don't be cheap, you are the one who needs the PA's, not your employees. If you did not pay me to get the PA's, I would stay long enough to get experience, and then find a real job, and move on. Also, get them the courses eventualy, if they get the PA's for your advantage.
Go to Avaya university online and check out the courses on the IPO, they list assesments as well.
You do not always get what you pay for, but you never get what you do not pay for.