I wrote a new post on my site about stamp collecting tips. I was going to post it here, but it got long enough that I thought I'd stick it over at mcgees.org. You can find it at
http://mcg.ee/smcs with all the links and formatting.
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There's an odd phenomenon in which one collecting field will have some things much more cheaply than in other fields, and some things much more expensively. Here are some ideas for using other types of stores, or other collecting fields' supplies, to help with stamp collecting, sorting, and shipping. There are of course converse cases, but those belong in other forums. :^D
TRADING CARDS
Padded 3-ring binders are much cheaper in trading card collecting than in stamp collecting, and sometimes even cheaper than non-padded ones from the office center. They're great if you don't mind a logo on the front (most have one) — or those can be easily covered with a label.
"Toploaders" — hard cases — are cheap and great for inserting a stamp or small pane or cutout into to mail cheaply, and not to set off security if mailed overseas. These are under 15¢ apiece.
"Penny sleeves" — thin archival plastic sleeves to securely hold a trading card — are crystal clear (you can easily scan through them, for instance) and are great for stamps. They don't seal like most stamp bags do, but they are super-cheap (about $1 for 100 — it's not just a clever nickname!) One can fold them over and hold them securely with sticky tape. Make sure to fold them — you don't want stamps sliding up and touching tape adhesive!
COMICS
Comic "Bags & Boards" have lots of uses. Put a backing board into the mylar sleeve, slide a stamp sheet in front of it, fold the flap over and seal it. A "Current Comic" size cut into thirds fits perfectly into a #6¾ envelope; therefore they can be used to stiffen covers sent for first-day servicing or can stiffen FDC-size polybags and glassines. These are around 9¢ apiece for a pair of bag and board.
OFFICE SUPPLY STORES
Letter filing and storage boxes are frequently much less expensive at office supply houses than through stamp supply mail-order houses.
CRAFT STORES
"Archival mist" — an aerosol can or spray bottle full of alkaline fluid to deter yellowing of acid paper — can be a tenth of the cost at a craft store compared to stamp supplies. This is easier to get in a walk-in store than by mail order, too, because some have shipping restrictions.
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Any other ideas for cost savings in philately? Add them as you like!