Community colleges offer Cisco CCNA and other IT / computer related courses at very affordable rates.

Most of the accelerated, privately-run continued-ed companies are much more expensive, and I'd be very careful vetting them to make sure there is value for your dollar and time.

Most of your manufacturers have online training of one sort or another. And I always ask tech-support engineers to explain and demonstrate what they're doing when I utilize them. Even if its something you think you're familiar with, you can learn tricks, shortcuts, and other helpful info from someone who lives in the IT field.