Is it possible to get a cheap personal wi-fi hotspot?

The internet connection in my house has recently gotten SUPER unstable (ping going into the thousands, connections timing out, etc. Etc.) because we have four people (myself included) that have computers that use the internet, but most of the time only three people are using it at once. My grandma, stepdad, and myself. What happens is that they'll use it, and then my internet ALWAYS seems to get the short end of the stick, especially when my dad is watching YouTube or downloading stuff on uTorrent. This results in me experiencing unbearable lag when I'm gaming, and making it almost impossible for me to do my homework. And my grandparents (owners of the house) are probably not going to upgrade our internet connection. So is it possible to acquire a "personal hotspot" of sorts so I can do my homework and game in peace?

Also, I don't own a smartphone, so using the "mobile hotspot" feature isn't an option.
Added (1). And let me clarify, I do not own any device that could be converted into a hotspot (iPad, Smart Phones, etc.) I have a laptop and a crap phone.

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