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It is one of them but.... there are also people on the forums under the "Redemption Market" page that sell single cards at discounts and / or trade for them as well.

TLG is a good place to default if you can't find someone on the forums that has what you need. Ken has decent prices that are generally the default "trade value" of most singles as well, though some people go up or down from there as well.

If you want convenience, TLG is the place to go.  You can get whatever card you want whenever you want provided you have the money.

If you want a bargain, the market is the place to go.  People sell cheaper here than at TLG but you have to find someone who is selling what you want.

IMHO TLG has been the mainstay of buying singles however the new kid on the block is Gem City (yes, my actual store) that sells singles at about half of TLG prices (also known as GEM prices). Check out the link below. I am currently in the process of buying a large collection from someone else who used to sell singles on the boards (shout out to Cybercrusader's Realm). When I get those in hand my inventory will be significantly larger. I do not guarantee mint condition but I will give you the best copy of the card that I have.

http://www.cactusgamedesign.com/message_boards/redemption-market/uthminister's-gem-city-games-redemption-store/