Interesting discussion....Yea, a month old but, I figured I would join in. $100 ? Hmmm... If I had $200, I could last a very long time. Would this include something you could repair ? I am a very avid deal hunter and if I had $100 to spend, let's see....
A Xbox 360 (old 20gb model), they could be had for $50-75 normally but, if you shop around, you might be able to get a RROD unopened one for $20-30, let's say I get lucky, find one for $20-25 (a working one is possible), spend $3 on CPU stuff, fix it, Then I would buy $30 worth of games for....What you ask ? Think about all the 1-3 year games for the xbox 360, some great titles, they can be had for $3-5 each (yard sales, pawn shops, ebay)...Games like GTA 4, Red Dead, Forza 1 and 2, halo 2-4, If you hunt hard enough, you might be able to score 5-10 games and a working 360 for under $50-55...(might be hard but, it could happen if you have the time).
Now, the other aspect, say I got lucky and got a 360 setup with games for $50....Then maybe a old fatboy PS3 with Uncharted (all 3 could be hand for the set for under $20 gamestop had a promo for used games), then a few other cheap but good titles could be had for $3-5 a pop... I have seen the old PS3s for as low as $40...(might be hard to track one down at that price right now)
So, yea, if you had the time to research and find the best deals, I bet you could find a kick-a$$ setup for around $100 but, I would bet if I had $200 to spend, I could 100% sure find everything I wanted here...
But, on the odd case it happened to me now...I have a Xbox one, 360, PS3, WiiU, 3DS, Vita, NES, SNES, Vectrex, 2600, 5200, 7800, Master system, Genesis, 5 full coin-op games, and PLENTY of games for each system and this is what I have in my home right now, I have a ton more in storage. I could last a VERY long time if I needed to....