So, you've poured out all this passion, burned up the keyboard on eBay, and worn the credit card to a mere nub. 

You've got a great collection. What next? How do you care for or conserve your preciousss  items?

First of all, I am not an expert. I am just sharing what has worked for me.

 I store flat ephemera in acid free albums  Hobby Lobby  ( http://www.hobbylobby.com ) carries their own brand, and the Pioneer brand is also good. Both are available in multiple sizes, with expandable pages. The pages come with thick stock inserts (available in black or white, if you're picky that way), which can be removed if you want to view both sides of an item. The Oscar Ads in particular make a stunning display in these types of albums.  Hobby Lobby also puts them on sale half-price about once a month, so you can get the larges sized album for about $15, and packets of extra pages for well under $5. The covers are quite heavy. These are very sturdy albums, look nice on bookshelves, and are worth every nickle you pay for them.

I also use Ultra-Pro and similar acid free storage pages for postcards, photos, and trading cards. I keep them in albums, and handle them as little as possible until they are in the album. If you fill an album too full, you risk curling or bending the things that are in them. There are several websites that sell these in bulk, for very reasonable prices. For trading cards, you can pick up large packs of UltraPro pages at Target for about $9.99 a pack. IMHO, UltraPro makes the best quality, and the most appealing looking pages, in all sizes.

If you are storing clippings or brochures, or other medium sized paper items, Office Depot, Staples, and the like sell boxes of report covers. They are supposed to be acid free, and fit in standard sized notebooks, and come in boxes of a couple of hundred for about ten bucks.

Target and Walmart sell very inexpensive plastic tubs in sizes ranging from shoebox sized to underbed sized, which are perfect for holding my collection of t-shirts, buttons, bookmarks, and even rolled banners.

For posters, I ordered a case of tubes from U-line ( http://www.uline.com ). The case holds 50 2" by 36 inch cardboard tubes (they come with stoppers).  Each tube holds 2 to 6 posters, and I have carefully written the name/publisher/source/move title of each poster that's in the tube. I kept the original box, which (naturally) holds all 50 tubes in the most efficient fashion.

Unfortunately, those mega mega banners, those are hard to store. You can buy large PVC plumbing pipes at Home Depot for next to nothing, and roll several up inside of them, but really, the only place to put those is pretty much under your bed. (Sorry, Frodo!)

And finally, I have not found any convenient way to store those bookstore displays. So I keep them flat, and in the very, very back of my closet, so at least I don't run into them all the time!

I went to Target, Home Depot, Lowes, and Ikea and got some very inexpensive, self-assemble bookcases. Then I went to Home Depot and bought sheets of the thinnest plexiglass that they had. I put Velcro buttons around the bookcases, and on the plexiglass, and voila! Instant "display cabinets". Yeah, it looks cheesy, but hey, it keeps the dust out.

I try to handle everything as little as possible to keep things in mint condition.

Also, windows to "The Shrine" (errrr, affectionate family name for my cave) are completely covered by heavy vinyl banners, to prevent the boxes for figures and other toys from fading. The Toybiz Cave Trolls in particular are notorious for disintegrating as they get older, so if you have one of these, please handle him carefully.