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: Tree-Free Greetings NC37794 Aunty Acid 4-Pack Artful Coaster Set, Magical Substance
Product description: Tree-Free Greetings strives to use the most eco friendly materials and processes possible. Printed and assembled in the USA, The Tree-Free Greetings 4-pack Artful Coaster Set is vibrantly printed with hard to find Magical Substance themed art and is great for everyday use. It is reusable, durable and easy to wipe clean. These non-slip coasters are printed with eco-friendly VOC-free, solvent-free water-based dye and will stay vibrant for the life of the product. The Tree-Free Greetings 4-pack Artful Coaster Set makes the perfect gift or souvenir. Save trees and spread joy. Buy a Tree-Free earth-friendly gift today. Aunty Acid - Wickedly Funny humor from Backland Studio. Search for more great humor on more great items on Amazon.
Product feature: Vibrantly printed, thick reusable non-slip coasters, 4 matching coasters per set in a gift able acrylic box, Made of absorbent, high quality neoprene, Easy to wipe clean with a little soap and water, Coffee, a magical substance, that turns Leave me alone or die into Good morning, Honey
Product price: $18.80
Product brand: Tree-Free Greetings
Target attributes: Quantity
Answer: attribute: quantity
value: 4 matching coasters
source: product feature
attribute: quantity
value: 4-pack
source: product title
attribute: quantity
value: 4-pack
source: product description