I also use a mouse for pixelart. Pixelart isn't exactly requiring the features that a tablet provides. There are maybe some features that could be interesting, but mostly it isn't required at all. But a tablet can still be used regardless and obviously can also be used to draw other stuff.
I personally recommend a cheap wacom over pretty much any other brand if you wanna buy one. Even though other brands can be dirt cheap, they often end up feeling cheaply made. Also seems like there's black cyber week right now with some nice discounts.