I love the idea of bitcoins and want to get involved in mining. I want to set up a rig to generate bitcoins however, I am on a type budget. Is it possible to make a cheap rig (under $100) that I can start with. I'm hoping that I can get a better rig if I make more bitcoins and understand it won't generate a ton of bitcoins. Thanks.
Under $100 won't be possible without using 100% second hand or spare parts. The cheapest possible new CPU/motherboard/RAM combo will cost $100 by itself, without a power supply, case, and graphics card to go with it. You absolutely need a graphics card to mine (ATI strongly recommended) otherwise you'll pay $2 for power to earn $1 in bitcoins.
GPU mining is coming to an end soon as well. Difficulty is about to increase 60% and the hash rate is accelerating. Everyone should assume they'll be making 25% of their current bitcoin income in a month's time, without the price of bitcoins going up. Is it still worth it?