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Amazon has 500-Cards SAT Vocabulary Flashcards: Reflecting the Most Frequently Tested SAT Words + Sorting Ring for Custom Study (Barron’s Test Prep) for $ 3.95. Shipping is free with Prime or on orders of $ 25+.

Each flashcard includes:
The target vocabulary word, along with a guide to its pronunciation and antonyms
The word’s definition, synonyms, and an example sentence that uses the word

Cards are arranged alphabetically in the box, with an extra place-marker card you can use to gauge your word-learning progress. With the enclosed metal key-ring-style card holder, you can arrange cards in any order for on-the-go study sessions.