Find it on Amazon! (all prices/items will be hypothetical)
1. Product A is for sale on amazon for $280
2. Post on craigslist in a big city saying you're selling for $320, leave a DEDICATED email address and say you only have ONE and the first person to email you gets it (urgency, it works, trust me, especially when it's just lead generation)
3. You will get flooded with people wanting to buy it (if its a big hit item), respond to these people saying you already sold it, and if theres anything you can do to help just ask.
4. 3-4 hours later (THIS IS IMPORTANT) say "HEY! Good news, I found some on amazon for even less than I was asking right here, talk about luck right?" and send your amazon affiliate link to the item.
NOW Listen Up
Don't put 3 and 4 in the same email, do you wanna look like you're trying to sell to them on this? No
People that respond are ALREADY WILLING to pay $320 for this, so you'll get an amazing conversion rate especially because they'd get it for less
Talk like a human being, not a commercial
Good luck =)