I was looking through the league for some players who have not been mentioned but could be low cost unexciting short term options to help the Cs this year. I left out the obvious players (Noel, Bogut, Nurkic, Okafor) who have been mentioned in tons of trade ideas or rumors.
Ideas
Ed Davis, having a down year but would be hands down the best rebounding big on the Cs.
Roy Hibbert, not a great style fit but as a 10mpg guy maybe BS can get him back to a shadow of his Pacers days.
Koufas, not ideal fit but an improvement. 2 years remaining on his contract is an issue
Baynes, minor improvement over Amir
Jordan Hill, not a huge fan but he is a solid rebounder
Ajinca, on paper a great fit 7'2 rim protector with a nice jump shot.
Miles Plumlee, biggest talent on this list, lacks great length or a jumper but is an elite passing big man. He is a FA and likely due a big pay day
Jeff Withey, rebounds and protects the rim on a cheap 1 year deal
Cole Aldrich, only next year in guaranteed. He is a rim protector and rebounder currently under performing in a limited role
Out of the above list Aldrich, Ajinca and Davis seem like nice fits to take Zellers roster spot and compete for minutes with Amir.