I was reading on the ModPodgeRocks blog about a new group buy site called MassDrop
https://www.massdrop.com/home
You can go there to read all about it. They are having a buy on The Twinery twine right now, 22 color sampler pack, 15+ yards of each color for only $24.50 plus shipping ($4 in the USA) which make each color just $1.30 or $0.09 per yard. They are having a 3 pack of larger spools also, but you will have to go there to find the details.
You can suggest items for group buys,vote on polls for other buys, so the members get to decide on what the buys are. The more people joining a buy the greater the discount. (The twine is at the greatest discount of 37% off.). I placed my order for twine, and you don't get charged untl the buy is complete. So even if you join a buy early, if the price drops, you will only be charged the lowest price.
ETA: There is only 14 hours left on this buy as of 8:38pm mountain time 4/22