Comic Book Resources has a fantastic first-hand account of ordering a live miniature monkey from a comic book advertisment.

Jeff Tuthill ordered one for about $25 in the early 1970s. Not wanting his parents to know, he had it shipped to his friend's house:

It came in this little cardboard box. I mean, I'm saying small. It was probably the size of a shoebox, except it was higher. It had a little chicken wire screen window in it. There was a cut out. All you could see if you looked in there was his face. I brought it home, and I actually snuck it into the basement of the house.

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No instructions [were included]. He had this waist belt on, a collar, if you will, on his waist, with an unattached leash inside the box. So I opened the box up inside the cage, the monkey jumped out, I withdrew the box and found the leash. I have no idea where it came from; I assumed it came from Florida. I figured, well, it's probably near dehydration, so I opened up the cage to put some water in it. It leapt out of the cage when I opened it up the second time! I mean, it was eyeing the pipes that I was unaware of. As soon as I opened the cage, it leapt up and grabbed onto the plumbing up on the ceiling and started using them like monkey bars, and he was just shooting along in the basement, chirping pretty loud. It was heading towards the finished side of the basement, where there was a drop ceiling, and if it got into those channels, I never would have got it. It would have been days to get this thing out of there. I grabbed it by its tail, and it came down on, starting literally up by my shoulder, like a drill press it landed on my arm, and every bite was breaking flesh. It was literally like an unsewing machine. It was literally unsewing my arm coming down, and I was pouring blood. I grabbed it by its neck with both my wrists, threw it back in the cage. It's screaming like a scalded cat. I'm pouring blood. My friend's laughing uncontrollably, and my father finally comes in the basement door and goes, 'Jeffery! What are you doing to that rabbit?' And I go, 'It's not a rabbit, it's a monkey, and it just bit the hell out of me.' 'A monkey? Bring it up here!' I'm pouring, I wrapped a t-shirt around my arm to stave off the bleeding, carried the cage upstairs, and I don't know why I bothered sneaking it in, because they fell in love with it, and it was like, there was no problem at all. They took me to the emergency room and I got 28 stitches on my arm.