My socmate has Sala on auction here on EF and got his start bid of 12k, so that's something to look at as a minimum. He is missing the feet so you can probably add another 1k or more onto that.
I haven't seen any Thunderbird sales for a while now but a couple of months back it was going around 8k-10k. It might be possible to get it cheaper now due to the overall fall in prices.