Its a 24 Volt, 40x10 mm fan - not sure of places USA people shop for electronics (I am in the UK myself), but something like this on Amazon:

http://www.amazon.com/Vktech-40x10mm...rds=40+24v+fan
http://www.amazon.com/TOOGOO-10mm-Bl...ref=pd_cp_pc_2


Before attempting glue, double check all the fan blades haven't lost anything of their edges or damaged in anyway - a tiny bit of missing plastic off a blade will make the fan more noisy than it needs to be and can make it "unbalanced" when it spins - meaning it may rub against the outside edge, and the stock fans are not exactly quiet to begin with even unbroken

Unplug from the mains, trace back the red and black wire to their source - I can't remember off hand if it plugs into the mainboard or straight to the PSU on mine, its one or the other.
Check the connection, if its soldered and you haven't done electronics soldering work before then I would go with snipping the original wire closer to the fan end and attaching the new fan to those wires using crimps or a screw terminal. You "could" use tape and twisting the wires together, but it would always be the last option in my experience it is never the most reliable connection method.
If it goes back to the powersupply unit then they are simple screw down terminals which should be a piece of cake to do with just a screwdriver.