Wormer and poultry dust are cheap.I am sad to here that all I know to do is a bit on the expensive side, I know that chickens like dried or live meal worms and as for the polish try cherry tomatoes, grapes, or watermelon the chickens will go nuts for the treats and can gain a bit of weight and, once you have them eating then mix oyster shells into their food, and they will hopefully lay more eggs, keep us posted and I hopefor the best.
-Kathy