2014 AMC 12B Problem 2

Orvin went to the store with just enough money to buy 30 balloons. When he arrived he discovered that the store had a special sale on balloons: buy 1 balloon at the regular price and get a second at \frac{1}{3} off the regular price. What is the greatest number of balloons Orvin could buy?

\textbf{(A)}\ 33\qquad\textbf{(B)}\ 34\qquad\textbf{(C)}\ 36\qquad\textbf{(D)}\ 38\qquad\textbf{(E)}\ 39

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.