I am thinking about getting an HQ16 sitdown model so if anyone has one I would love to hear from you.
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Have you checked out Craig's List? Some folks find some neat things there.
Don't go alone to anyone's house. Meet in a public place, an opened store lot or cafe with lots of other people around.
Don't carry a lot of cash that can be seen, put it in an inside pocket.
Have someone go with you, the bigger he is the better. Someone who looks like a heavyweight pro wrestler would be nice.
Know your machines and give it a close look before buying.