I don't know if you've found a rental in Twin Falls yet, but the best price I see on the list put out by the Twin Falls Board of Realtors is $275 for a studio apartment. Everything else is from $350 and up, mostly up. If you'd like to contact me I'd be happy to provide you with the current rental list. It comes out every Friday.
If you are referring to $100 to $200 a month, your options in rentals may be limited. your best bet is to check with some local agents who specialize in property management to see if anything like that exists in your area. good luck with your search for a rental.