Just a quick point that probably applies to the majority of people on here: just claim expenses equal to whatever the hell you want to claim to offset the 1099. Unless you make a significant amount, there is a next-to-zero chance of being audited. And even then, all you would have to do is show a piece of paper, even one you wrote yourself, showing the expense.
If this is your main livelihood, OK, different story, but if it is, well, you should have been claiming all of this already.
And if you are worried about the added value gained in turning around a knife that went up in value, well, I've got bad news for you: that was already taxable. But it was also pretty easy to avoid - and still will be. It's just an extra step.