A quick look on Ebay UK shows 8 sandcasts for sale presently, various conditions from original to restored, and with prices in the range of £16000 (GBP) through to £35000. Several of these have been for sale for a long time (more than a year for sure), and some have been reduced in price several times and still not sold.
Prices here in the UK have peaked, some suggest they are 30% down. Personally I think that for more than £20,000 GBP it needs to be either exceptional in originality or standard of restoration, and / or a particularly early example.
There is certainly choice out there, I guess it is just a case of making the effort to assess how good the example you are thinking of buying really is, and factoring in the added costs of buying something which is not in your own country!
