Purchased from the Anatomical Chart Company through a (no longer available) web site named Boneyard Bargains, created and maintained by Rus Hardy. (The bones can still be purchased direct from ACC, but they are quite expensive now.)

Pictured at right is 10 lbs of assorted bones, exactly as they arrived from ACC. Down below is another image with them spread out on a table. This mix includes bones from both the Bucky and Thrifty models, and is sold under the name "Bones by the Pound". You could decide how many pounds to buy, and the assortment was different every time.

I also purchased two life-size "Bucky" skulls and three smaller "Thrifty" skulls. All of these arrived in great shape and will be a welcome addition to the house this year. Overall I am very impressed with the bones and skulls. Even though they are billed as "4th class" items, they look great and have a nice "weight" to them.