We had 23 chicks on the kitchen table in a huge sterlite plastic box under a heat lamp until Wed (when we got rid of the males, so now we're down to 14 pullet chicks)
When people came over, they didn't realize we had them in the house, until they heard them chirping.
I have very cheap bed pads at the bottom of the box (the kind you find next to the Depends) For the first few days, it was just the bed pads, changed 3 times a day. I read here that the peat moss was a great material for the brooder, and so I bought some and put it on top of the bedpad.
Now, every two days, the whole mess is rolled up and changed.
There has been very little odor and the chicks love to take 'moss baths' in the freshly changed moss. I got a huge compressed block of it at the
Tractor Supply store on sale. The moss dries out the poo very quickly and does a great job of keeping the odor down. I figure this block will last me a long time. Someone else here said that plain potting soil (without the vermiculite and fertilizer additives) also works the same way and so does clean dustless play sand.
I don't think you need the bedpads if you use the moss, though, and they are costly even if you buy the cheap ones (I think its around $3.80 for 18 storebrand pads). My husband is very sensitive to odors, so it was worth it to us to use them for his comfort. They did keep the odor down when that was all that was in the brooder. As they aren't slippery like newspaper, the chicks could run around on them without falling, and it is easy enough to roll the old one up as we unroll the new one.