My 8 year old and I are moving out of my Dad's after 5 years of hard work, scrimping and saving. We're on an extremely tight budget, and it's going to be very hard on my daughter because our shared 8x10 room is all she's ever really known. I've decided to sacrifice a few things to get a desktop for her to keep some normalcy. Her favorite things in the world are Roblox and Minecraft, which she plays on my Dad's computer, but all I have is a little linux laptop that can't play Roblox. Some friends are also willing to give me an old monitor, keyboard and mouse. All I need is a desktop that can browse the net and play Roblox and Minecraft, for around $100. What kind of specs am I looking at and where can I find a machine like that?