depends on what you want to do.
NCIX MSI GeForce 210 589MHZ 512MB 800MHZ GDDR2 PCI-E VGA DVI HDMI HDCP Low Profile Fanless Video Card - 41.99
Regular price is 49.99
http://ncix.com/products/index.php?s...r&promoid=1223
is see some ranging at $30-60.. i dont think this card comes in GTS form.. but if it does, it wont make much difference for it is a fairly basic card.
so to answer your question, you can probably get it for under 100