I bought some before at one website... something called mystery stamps? you can google it first and find it out... I spent $2 on that before, got two packages of used stamps, there were 100 pieces in each package. I used them as gift for kids in China, no idea if they were good or not.

我就是零零散散的买，只买自己喜欢的，不想为收集而收集，美国的邮票是在乏善可陈，让人没有买年册的兴趣，英国法国的邮票就很漂亮，设计的非常棒，加拿大的也很不错，就是他们不按年册，按季册，感觉狂贵，加拿大铸币厂的币也真是华丽啊！！可惜也是太贵了