May be wrong but I think that most of these memories are dynamic so they need refresh and are not suitable for "simple" hardware. Also their access (address and data buses) is parallel and nowadays, mostly for hardware simplicity (and since speeds have raised a lot) most memories used in such hardware are serial SPI or I2C. --> I guess that a 1Mbit SPI RAM chip will cost you far less than the additional hardware required to use them
Seems that the ones on the bottom right are 8+1(parity) 256kx1-bit memory chips. They are also sold in ebay, so if you have many of them....
I used some of those as some sort of keyhanger on these fabric CD wallets. easier to carry the wallet when having your hands full and easier to open it.