From Red Heart they will be selling 1,000 yard size 10 thread for only $6.25. For now they only have 2 colors but maybe if we request it enough, they will make other colors in the bigger balls too. If you look really hard, you'll see that Red Heart is actually from Coats & Clark which is the same company that packages the Aunt Lydia Size 10. Maybe we will see a combination of the brands soon.
Right now the only company that sells big balls of colored crochet cotton is Pisgah Yarn Company. I can order them for you by request.
Aunt Lydia Size 10 Crochet Cotton is also coming out with some new colors. These will also be in stock soon. Let me know if you're interested so I can order enough for everyone.
Russet
Passionata
Olive
Pink Cameo
Peacock