What does the sentence mean? Here is the passage: Berlin — Germany is home to some of the world's best public universities, so it might stun Americans that attending them is essentially free: These academic giants don't charge any tuition fees at all. Many even offer degrees taught fully in English, programs specifically created to attract foreigners willing to come to Germany. But non-Germans looking to cash in on the bargain might have to do so quickly: Some states in Germany are reversing the tuition-free policy for many foreigners. What does "But non-Germans looking to cash in on the bargain might have to do so quickly" mean?