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I bought a key on ebay from a guy for my 98 and all i did was send him the OhM reading and he sent me the key,it was 10.00. Home Depot cut it for free because they didnt have a blank key to charge me for
Keys can be found at Ecklers for $14.99 you can also find them on ebay pretty cheap. You can find the key fobs also on ebay for around $15, (If you can't I have a #1 and a #2 I'll sell you for "$30 shipped for the pair, I don't know if they are new or not but they look it, but you should be able to find them on ebay cheap.)
Just use a meter across the chip on your current key and measure the resistance. (Put you meter to measure OHM's, then put one lead on one side of the key, on the chip and put the other lead on the other side of the key on the chip and read the meter)
Now there is a variation + or - about 5%, Once you get the VATS # order the key from Ecklers or find one on ebay. Once you get it take it to a locksmith to get it cut.