Amazon with ZG US has the 2-Pack QZYL Christmas 9 LED Bulbs Light Up Necklace for $7.99 - $2.40 off with coupon code FHE7OBFE at checkout = $5.59 with free shipping on $35+ or with Prime.

The 4-pack is also on sale for $8.39, while hte 8-pack goes for $13, after code FHE7OBFE.