Its very much try before you buy imo. Some of the longstanding bottlers you can maybe buy blind but you'll get your fingers burnt if you don't know your stuff.
Gordon & Macphail are a good place to start.
After that there's James Eadie, North Star, Cadenheads, Whisky Broker, Signatory.
Edit to say - sadly I think much of the value has gone, maybe try on auction... I got a 15yo Fettercairn for £40 and its tremendous, £65 RRP