you don't need another tablet- kindle fire is a ( sort of ) android tablet and you can get calibre companion from the amazon app store.
should be fine unless you have a very old model of fire
then you let calibre companion work as your local librarian. For best results, add a good epub reader also and send epubs to it
the latest fire HD tablets are dirt cheap and fine for reading + they come in 7, 8 10 inch sizes
for other brands, can't advise without knowing what else you want it to do, and what size you want it to be. if you don't mind used/refurbished, then ebay is a good source
for bargains. I mostly shop there and use the pro sellers who give a 12 month warranty on refurbished items
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