My Blazer did not have the RKE installed and I
was thinking of grabbing an RKE module from the
bone yard and buying a FOB online. Then use
programming procedures I have read about here.

Is there a specific FOB I need to buy? or will any GM
one work?

you would probably need to go to the dealer and get a specific FOB to work with your RKE model. youd probably have to get them to program it specifically for your RKE module, and you might also want to get the VIN # off of the Jimmy or blazer or s-10 or whatever car you get the module off of, because the dealers sometimes use them as references for what kind of FOB is needed for that module, and it also changes the way the program it, etc.

My Blazer did not have the RKE installed and I
was thinking of grabbing an RKE module from the
bone yard and buying a FOB online. Then use
programming procedures I have read about here.

Is there a specific FOB I need to buy? or will any GM
one work?

Good Advice I would not have thought to get the other vehicle VIN.
I know the dealer wants like $60+ for the FOB, so I was
looking to do this low cost and get an FOB online.
I have seen them pretty cheap, but I'm not sure
if all GM FOBS are the same.

I've been looking around the net, but it seems like
all different year FOB's may not work.

Does anyone know if all the FOB needs to be in the same
range? Or would only the dealer know?

What is a RKE and a FOB?

RKE = remote keyless entry
FOB = the remote thing on your keyring

thanks