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Some of those older, retired sets are absolute collector items now. Particularly the classic castle and space themes.

OH thank you sir brickmanbrad! What decades would those be? I'll keep my eye open now!

You'd be looking at 70s & 80s sets primarily. Fort Legorado and the Classic Space Monorail are two that spring immediately to mind

Thanks brickmanbrad, I'll keep an eye out for these!

I guess I'm not too old! haha

Nah, you ain't old, you're just getting more experienced!

You have spoken......wisely!!!