Can I purchase a Norditrac key for C2150. I lost mine

mobile Lock smith , A new key needs to be programmed

Cheapest alternative to purchase a "new" remote key fob is on eBay. Search for "remote key fob, 2004 Trailblazer". Check and/or inquire about programing instructions.

dealer ship would be the only possibility or replace ignition comes with new keys

I'am not toyota expert,but the dealer should be able to
use your VIN# to find out what key code came from the
factory

Also I see no reason that the immobilizer could not
be by passed or a product bought to install and eliminate it

I'm have no experience in that area, so keep that in mind

I would ,if it were mine, not do as the dealer suggested

the dealer can reprogramme the keys together (they use the computer/diagnostic machine)

go to nearest dealer and will have to purchase new fuel cap and they will be able to re-tumble new lock to your key and remove old cap

the only way is to take it to the dealer unless you have a scanner

go to the dealer with the vin and proof of purchase and they should be able to cut a key with this information you will also have to have proof of ownership.

for one like the factory one it will cost you any where from $40 or more if it have a security chip in it.