Official TVXQ! Website announced that the online sales of TVXQ! CONCERT – CIRCLE – #welcome OFFICIAL GOODS (concert held 07:00PM on the 5th and 6th of May at Jamsil Supplementary Stadium) will start on 4/25 through 11st !! (ends on 5/07)
Announced on their Facebook as well~

They will be sold via 11st global online store (available on CN and EN) as well! so ifans can pre-order the goods easily ^^*
Links will be accessible on the time of sales.

[ Online Sale Guide ]

▶ Open Date/Time : 2018. 04. 25 (WED) PM 14:00
▶ Acess URL
– PC Ver.: http://11st.kr/&B1JTut
– Mobile Ver.: http://11st.kr/&B1JVGB

▶ GLOBAL URL
– English PC Ver.: http://global.11st.kr/&B1JTT4
– English Mobile Ver.: http://11st.kr/&B1JTTS
– Chinese PC Ver.: http://global.11st.kr/&B1JTTH
– Chinese Mobile Ver.: http://11st.kr/&B1JTU5

Regarding the notice, it seems that:

• official fanlight an be picked up at the concert venue or after the concert dates via delivery
• official goods (26 types), can be picked up at the concert venue or via delivery from 4/30
• Do note though the products are available for online reservation, there will be limits to the quantities allowed for purchase. Purchase info will be announced

Extra:

A fan suggested that fans bring 3 AAA batteries to the concerts. It’s heard the fanlights don’t come with batteries [cr: @banhee_tvxq1226, translated by @snxy]

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Credits:

TVXQ! Official Website,
Poster notice Translated by @snxy,
Post Written and Shared by TVXQ! Express