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Walmart [walmart.com] is offering this 6-Pack Battery Operated Christmas Lights for $ 9.98(was $ 19.98). Shipping is free.

Low Battery Consumption: It has a compact battery pack (about 1" x 2") with ON / OFF switch.
Durable & Bendable Copper Wire:Made of flexible and sturdy copper wire with insulated lacquer, light-weight, easy to mold and bend into all shapes.