www.whiskyfinder.eu/ is a good place to start.
Here's a few links I found:
Ballantine, 30 years - £203.33 at
thewhiskyexchange.com
Teaninich, 23 years, 1973 - £100.00 at
thewhiskyvault.com
Royal Lochnagar - £275.00 at
thewhiskyvault.com
Friar John Cor Quincentenary - £357.61 at
thewhiskyexchange.com
Does that help?