How would you sell "Stuff"

As many of you know, my niche is Horror Movies. I have a horror movie blog, review site (~500 uniques daily) and mailing list (~1200 people).

I recently discovered a source for Horror Movie Posters that are either public domain or otherwise cheap. They cost me $1.13, and they sell for $9.00. I've been selling them on the site for a while, and I've done price testing all the way down to $4.00, and the price doesn't seem to have much change to sales. As long as the total cost is under $10, it all seems to be the same to the buyers. I'm able to sell 1-5 of these per day.

My supplier (sorry, not divulging) now that I've bought over 1000 of these from him is considering starting a drop-ship relationship for me. He'd be willing to do $2.75/each, shipped. This is interesting to me, as it means I'm no longer limited by my stock on hand or my time, and I can sell as many as I want -- and instead of only having the 10 choices I could afford, I can use his catalog of 100s.

However, I don't think there's growth to be had from selling to my customers/readers.

So, how would you sell a low-value good like this?

1. PPC -- Assuming a 4% CR, I would have to have the lowest CPC ever, like about 12 cents. And it would have to be on Horror Key words. Not sure that's a winning strategy.
2. Organic Search -- Very few people search for "Horror Posters" so it seems unlikely this would make much of a difference.
3. Affiliates? Even if I offered $5/sale, is that even worth it to me/affiliates?
4. Ebay?

Anyone have any good ideas? I'm afraid to let this opportunity go by...