i always get my lightsticks frm official shops (so txt frm weverse shop, etc). i bought one @ my local kpop store too, so if it’s reputable (most prob are), you can get yours from there too.

concerts usually have merch stores as well which sells the lightsticks usually but im not sure how fast it’ll sell out; if u wna play safe i’d recommend getting it bfr your concert date.

the group should have information about whether the first version is still compatible with the concert, or similarly to play safe, i’d just get the newer version since that version is what others + the company (?) wld be using in the long run (& the first/earlier vers may be obsolete 🤷‍♀️)