the store here is good to get fets if you only need a couple but if you want to buy more than 25$ worth (they're about 2.50 a pop)
www.digi-key.com is you best source. Neo magnets give more torque but lower top speed. A step up from sb mags
180's don't have neo magnets nor bb cans...if you get a fk-180 or a team orion they both have carbon brushes.