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JavaScript (Node.js), (削除) 38 (削除ここまで) (削除) 36 (削除ここまで) 32 bytes

(削除) s=>s.replace(/(.)(.)( |$)/g,"2ドル1ドル ") (削除ここまで)

s=>s.replace(/(.)(.)\b/g,"2ドル1ドル")

Try it online!

RegExp approach courtesy @Giuseppe (although I thought of this independently), assuming words separated by only one space

-2 for only considering 1 space and add trailing space

-4 Thanks @Shaggy