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Trying to buy just an electrical connector maybe a big feat. Doubt you can buy them from the dealerships.
Last time I tried to buy a three prong connector like the one on the A/C pressure sensor, the dealer wanted some astronomical number, like I want to say $100 or so. That is at my ~20% below retail discount, too.
You would probably be better off going to a junkyard and cutting one off a vehicle yourself.
You're looking for just the connector itself that you can splice on, right? I have one that's been cut off and has a foot or two of wire on it so you'd have to splice it in. If that's what you're looking for you can just have it, PM me your address.
For future reference for anyone that needs one, these MAF's came in many, many 2000+ GM vehicles. You can probably get a connector from your local junkyard for a couple bucks. See this post for a list of vehicles (can also get cheap 85 mm MAF upgrade too, that's what I just did):