The Amazon Fire HD Tablet 8 is $49 and it works. You have to do a little bit of modification (download some APKs), but it's very simple. Check out the video below to free the tablet of Amazon restrictions and access the google play store.
Once you get the google play store, then you can download the google drive app and google sheets. You will not be able to run opensolver (optimizer), but the MME sheet runs a very similar operation.