I had the chance to come to Taipei to buy some packs of brown sugar ginger tea. While it’s a local product, you can expect it to be cheaper than buying it out of Taiwan.
Wherever you stay, you can conveniently take a Metro to Danshui Station 淡水站. From the city, it’s about 40-50 minutes Metro journey. Exit Danshui Station towards Zhongzheng Road 中正路.
Walk straight on Zhongzheng Road until you come to an alley that sells the famous Danshui iron egg, plum drinks, and the famous Danshui food A-gei 啊給.
Walk on this alley and find the Black Gold Legend 黑金傳 shop.
One pack is TWD200 but they offer a promotion price of TWD2,000 for 12 packs (about TWD166 per pack). You can try all the flavours available before decide which you like.
They have 2 shops in Danshui but I normally go to the one at Gongming Road 公明街 (which is the one on the alley). If you buy alot, you can try asking the Aunty to deliver to the place you stay but you will need to allow at least 2-3 days before your departure.
You can try calling for more information below.