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Your other main option is Amazon Appstore, but they take a percentage as well. Sure if you wanted to avoid any merchant percentile takes, think you'd have to see about selling it yourself from your own website, so you keep 100%. Which might not be straight forward at all, because you'd have to have your own method accepting credit cards via your bank's merchant services, or perhaps use Paypal. Users would have to change their device settings to allow the installation of untrusted app sources, i.e. sideloading, the default is usually OFF. Any incompatibilities with users' devices you'd have to resolve yourself. You might have piracy to contend with, someone purchases your app, and then shares it out for the whole world via bittorrent or something. So you may need to consider your own DRM copyright protection scheme possibly. Unless you can trust your customers to be totally honest.
I presume you're not planning on selling any Apple iOS apps at any time.
....and then unsuspecting and unknowing Joe Public wonders what happened, faces costly repairs for re-flashing, or even has to buy a new phone or tablet.