Now are well into the credit crunch, saving money is a premium, so here are links to tarot decks you can print out yourself. You will need a colour printer that is capable of printing on card, and a steady hand to cut the images out.
If you need a set of borders to get you going, these are a good idea
Alternatively, you can purchase a set of blank tarot cards
Rider-Waite Tarot at Wikipedia has full size images of all the cards. If you are not happy with the colours, you can always come up with your own scheme using the Rider-Waite black and white cards.
For the more artistically challenged, you can create a set of 22 Major cards using drag and drop from the supplied images. The range of options is not particularly big, but its a start.