Well, your best bet is going to be buying one used from a local seller... I wouldn't expect it to cost a lot given that most Supra owners prefer to swap them out for manual transmissions. I would really try to find one locally first though, shipping isn't going to be fun.
Post ads in the classifieds' want to buy section here and at the other various Supra sites.
If you're looking for "brand new" I don't think you can still get them... might be some in mothballs somewhere, but that you'll have to go to a dealer for. MSRP for a new one is: $3665.82 Champion Toyota out of TX shows their retail at about $2800.
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