Personally I haven't seen any guys on the forum running rear coil spacers that big. Most people are at 1.75" max. So I kinda doubt you'll find anyone selling used ones here.... But maybe something will pop up for you.
I'm assuming you've looked around online for them a bit. Top Gun Customz makes them for a fairly reasonable price. Here's the link in case you haven't seen them.
I'd say it's definitely worth calling them. I'm guessing they just mass produce those things and throw them in big bins until they're ready to ship. Don't see why they couldn't take just one out to ship separately.