WHich modem or hotspot modem , wifi modem is affordale and cheap for private use ?

I actually need one but wanna ask here if there's any other way to browse and enjoy the internet in a cheaper way since is a private use to only one PC @ home. Especially the one I can download and watch videos online without extra charges.
U can reccomend an android fone or any other make of fone that can deliver such...

Thanks as I wait for ur candid suggestions.