Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Halloween Enter If You Dare Banner
Product description: Banner Creepy Carnival
Product feature: High quality product, Halloween themed, Plastic construction, Measures 1
Product price: $6.99
Product brand: Amscan
Target attributes: Sign Type
Answer: attribute: sign type
value: banner
source: product description
attribute: sign type
value: banner
source: product title