Here you go! I've included a stock photo of them along with my picture, since my phone camera is terrible.
Double-sided movie posters - 40" x 27" - $20 - These are the real deal. First-run posters made for theaters. I have multiples! http://www.sunshinecomics.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/s/e/serenity_movie_poster.jpg http://i.imgur.com/ogD36h8.jpg
Mini movie posters - 17" x 11" - $8 - One-sided. Multiples! http://ep.yimg.com/ca/I/yhst-128366933912873_2270_300822460 http://i.imgur.com/Wj2pAUF.jpg
German movie poster - 33" x 23.5" - $30 http://www.serenitystuff.com/wp-content/uploads/2006/01/serenity_poster_german.jpg http://i.imgur.com/mHCGo9n.jpg
Mini UK movie poster - 12" X 16" - $10 - Multiples! http://ecx.images-amazon.com/images/I/51zJ8dedYQL.jpg http://i.imgur.com/I3jKV1J.jpg
Big Damn Poster - 48" x 70" - $350 - The crown jewel, the pièce de résistance. This one-of-a-kind poster is a gargantuan 70" tall and is signed by Summer Glau and Ron Glass. It is gorgeous. Take it from me. Pic taken with a full-sized poster for reference. http://i.imgur.com/EHAO972.jpg http://i.imgur.com/Rky80mw.jpg
Coming Soon" press sheet - 7.5" x11" - $2.50 - Multiples! - These were handed out at the pre-release screenings. Couldn't find a stock photo. "Coming Soon" press sheet signed by Nathan Fillion and Ron Glass - 7.5" x11" - $8 http://www.serenityverse.com/images/albums/userpics/10001/Sheet_01_200_8.jpg http://i.imgur.com/6egz2yp.jpg
Cat Staggs Jayne print - 9.5" x 13" - $20 - Signed! Couldn't find a stock photo. http://i.imgur.com/9XmJnqR.jpg
Tri-fold promotional flyer - 8" x 33" unfolded - $6 - Multiples http://www.serenityverse.com/images/albums/userpics/10001/Brochure_A_500_8.jpg http://i.imgur.com/lrfqEdI.jpg
Other swag!
Serenity binder - Never taken out of plastic - $60 http://www.serenityverse.com/images/albums/userpics/serenityalbum.jpg http://i.imgur.com/0j3bJCM.jpg
Film cell viewfinders - These are single cels from the preview reels put into a plastic viewfinder. Multiples! http://i.imgur.com/2qi8Zni.jpg
Mal - $5 - http://i.imgur.com/2SWE3GM.jpg Zoe - $5 - http://i.imgur.com/pkNmnRn.jpg Jayne - $5 - http://i.imgur.com/UFYG4yZ.jpg Mr Universe - $3 - http://i.imgur.com/cV7U3j0.jpg River ow - $3 - http://i.imgur.com/n2Fakca.jpg Operative - $3 - http://i.imgur.com/32xshpw.jpg Kaylee - $5 - http://i.imgur.com/aUuBkbS.jpg Simon - $5 - http://i.imgur.com/fkDyW9M.jpg
Film cel keychains - Two consecutive film cels in one keychain, along with a "Serenity" logo at the bottom. Logo is printed on glow in the dark paper. Some have a little bit of scratching on the plastic. Sorry for the glare/phone reflection. http://i.imgur.com/kZpE8Rv.jpg
Operative/River - $15 - http://i.imgur.com/pYufUBI.jpg Mal/River kicking ass - $10 - http://i.imgur.com/fLLXGaj.jpg Operative/Mal and Inara - $15 - http://i.imgur.com/ykdIwQT.jpg River/River at school - $15 - http://i.imgur.com/zqhO8yE.jpg River kicking ass - $5 - http://i.imgur.com/WHTiASy.jpg River pulls a gun on Mal - $10 - http://i.imgur.com/eZscuF6.jpg River/Operative - $15 - http://i.imgur.com/pYufUBI.jpg River at school/Ow - $10 - http://i.imgur.com/I8gbnoV.jpg Mal/River at the helm - $10 - http://i.imgur.com/6cTzEBI.jpg Operative/River #2 - $15 - http://i.imgur.com/9hz3EN5.jpg
Buttons - 2 1/2" buttons given out at the preview showings - $1.50 - Multiples! http://www.serenityverse.com/images/albums/userpics/10001/serenity-button.jpg http://i.imgur.com/EThKnIQ.jpg
All USPS Priority Mail because fuck yeah, free boxes and envelopes.
Posters - $13. I can fit multiple posters/flyers/etc into a single tube. Big Damn Poster: $35. It's ~$20 for the tube(s) and ~$20 for postage. Viewfinders/Buttons/Keychains - $6 for up to 5 Binder - $7
