Thanks for the input guys, it was worth a try anyway. I don't think I can do this one myself (don't have a lift or access to one) so I guess I'll have to tow it up to the AAMCO and let them work on it. Wouldn't trust them for a rebuild but I bet they can handle a simple solenoid.
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I'd call around before I brought the car in.

Oh for sure, I just figured AAMCO cause everyone I've talked to says they tend to be the cheapest.

Any idea (just a general figure would work) how much a shop might charge so I can begin planning this out? Shops aren't open today.
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They are FAR from the cheapest! I would guess 6 hours labor plus parts and fluid.

Well, I ended up towing it up to the Buick/Cadillac dealership. Cheaper than AAMCO!
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Keep us posted.

Just got a price quote, it will need a new solenoid, they had to order it but they hope to get it done Wednesday or Thursday. $659 for the repair, and that includes their diagnostic service. Seems fair? Does to me. AAMCO charged more per hour for labor.
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I don't know what trans your car has, but if it has a 4T65-E, make sure that they install a new Electronic Pressure Control Solenoid while they have the side cover off.

It's a 4T60E, thankfully! No pesky PCS to worry about, although I suppose now, that's really of very little comfort.
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Well, I tried!