Before you spend an exorbiant amount of money on a course make sure it it geared toward passing the PMP exam. I've seen courses that are just the 'instructor' talking about project manangement but no exams or questions at the end. Some will even give the exam at the end. Another thing is for the PMP cert you have to have a certain number of hours actually working on project management, if you don't have the practical hours then you'll get the CAPM certificate.
Yeah, most quick and dirty courses are "intro to project management" or "foundations of project management" types of courses just meant to give people bare bones fundamentals.
The one's I've found are there pretty much to take your money. Not much in the way of value unless they include the PMBOK.
A better and cheaper method is to purchase the PMBOK, Rita's PMP Management study (or similar but check the reviews), study your ass off for a couple/few weeks and take the exam. But, like I said if you don't have experience in utilizing PMP methodology then you'll be studying for the CAPM and once you get the required experience then the PMP certification.
A 3-day program won't get you much. And I doubt it's the type of certification that is recognized by employers who are seeking accredited / certified project managers. Getting legitimately certified in project management is a lengthy process and usually also involves a practicum of some sort. Put it this way: you'd have a better shot at a job than someone who has zero experience and zero training in project management but you wouldn't have a better shot than someone with plenty of experience in project management despite having zero training.
Keep working, do accredited courses at night or on weekends so you gain credits towards your PMP certification, get certified, look for promotions or other jobs that require PMP certifications.