You can find your favorite on here!
http://www.shanghainavi.com/shop/216/
http://www.shanghainavi.com/shop/92
http://www.shanghainavi.com/shop/45/
http://www.shanghainavi.com/shop/65/
http://www.shanghainavi.com/shop/42/
Or, HangZhou is famous for 龍井(龙井)茶, so you can visit China Tea museum.
http://www.raku-kobo.com/tea/black/8nen.html
http://www.togenkyo.net/modules/tea/171.html
http://hojotea.com/item/b02.htm
http://ja.wikipedia.org/wiki/%E6%AD%A3%E5%B1%B1%E5%B0%8F%E7%A8%AE
http://ja.wikipedia.org/wiki/%E9%89%84%E8%A6%B3%E9%9F%B3
http://ja.wikipedia.org/wiki/%E9%BE%8D%E4%BA%95%E8%8C%B6