Came across these and thought I'd share. I've always bought OEM from Joe but the aftermarkets are so much cheaper, it's hard to resist.
http://revolutionsupply.com/(S(koxp5r55d4xj1i45ipnqho2l))/TPMS/AppGuide.aspx
For a 2003 Infiniti FX45
OEM 40700-CD001 $88.77 (ones you buy from Infiniti)
Aftermarket Sensor SC20064 $65.31 (ones you buy from Tire Rack or online -- Schrader makes them and is the exact same as the OEM, except for the color and part number)
Import Sensors SCD001 $38.64 (made by Orange Electric)
Note that you have the option of USPS Priority mail shipping which is just under $6 I believe, you cannot get this option until checkout.
http://revolutionsupply.com/(S(koxp5r55d4xj1i45ipnqho2l))/TPMS/AppGuide.aspx
For a 2003 Infiniti FX45
OEM 40700-CD001 $88.77 (ones you buy from Infiniti)
Aftermarket Sensor SC20064 $65.31 (ones you buy from Tire Rack or online -- Schrader makes them and is the exact same as the OEM, except for the color and part number)
Import Sensors SCD001 $38.64 (made by Orange Electric)
Note that you have the option of USPS Priority mail shipping which is just under $6 I believe, you cannot get this option until checkout.