Currently the best nVidia card for less than $110 is a GTX 650 1GB.
The absolute cheapest one is made by PNY for $90 after $20 rebate + free shipping. However, reviews are only average; 3 eggs.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814133471
The next cheapest is the following EVGA for $100 after a $20 rebate + free shipping. It has a lot of really good reviews; 5 eggs.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130827
Last is the following Galaxy for $100 after $20 rebate + $3 shipping. Good reviews, but there are only 11 reviews.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814162124
Finally, if you do not want to bother with rebates to get the price to $110 or less, then there's the following GT 650 from Zotac. $110 + free shipping. But it has only 2 reviews, but both are 5 eggs.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814500294