snap up 抢购，赶紧买下

【例句】
It's difficult to snap up tickets during the Spring Festival travel season. 　　
春运期间，火车票非常难买。

Would they renew or release? Snap up or toss out renewal offers that arrived in the mail?
他们会继续还是退票？是抢购还是通过邮件提出退票的要求？