For years I have bought cards from Dave and Adam's Card World (dacardworld.com) -- from boxes to singles. DAcardworld seems to be going through an lotr liquidation phase right now, and offers MASSIVE deals currently. Right now you can buy a 100-box lot of
Black Rider for $500 - only $5 per box. Insane. This site also offers a bunch of other liquidation deals, such as cases.
Another site of interest, Potomac Distribution (potomacdist.com) offers very competent prices, and more variety than many other e-shop sites. What I like about Potomacdist is that they sale a lot of "damaged" boxes of cards, which have greatly reduced prices. Potomacdist also sells lots of 12-box lots. Potomacdist also does completely free shipping to all 48 mainland u.s. States! However, to qualify You must order $150 minumum.
I thought this would be a great time to post, since LOTR is becoming cheaper than before.