How to physically move large heavy 100lb amplifiers easily (up and downstairs)

Ideally with only one person, but even with 2 especially if there are stairs involved, how can I move this gear without breaking my back or hurting myself?
Seriously, in an arena where $5k components are considered just "good", why skimp when it comes to moving components? Hire professional piano movers for heavy amplifiers and loudspeakers.  They know how to move large, awkwardly shaped and heavy objects carefully.  It will cost in the $200-500 range.

You could also look at it from a different perspective.  In motorcycling if your bike tips over the rider should be able to get it upright without anyone else's help.  If you can't, then maybe you should get a smaller motorcycle.  Same goes for audio equipment.  There's plenty of great sounding equipment out there that will still break your bank account, but not your back.
If you can't lift 100 lbs by yourself - then you need another person besides wifey/gf/daughter who is strong enough and won't drop it.  I once tried to take a Proceed 5 ch amp (~100 lbs) up a floor. The problem with the amp was that all the weight was in the front and it almost took my toe off, luckily I was able to slowly lower the amp to the floor without damaging it. Amps that weigh ~ 100 lbs are meant to be stationary. Handcarts etc can be handy, but if it rolls own the stairs and knocks your granny over, its pretty much over.
You people live in a world where neighborhood teenagers will help with menial tasks for $10 or $20?  Wow. 
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When we get older, install one of those to transport our-self and equipment.