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Not an expert but....
That'll give you an idea of the good years - All my good ones were either gifts or bought from Porto so can't help with the where from. A quick google should find you an online dealer. £100 can get you something very nice indeed especially if you are laying it down.
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Might not be quite what you are after but you can by a voucher for this years port, and exchange it for the real thing once it is bottled, did this for my niece
http://www.vintagewineandport.co.uk/vintage-port/2018-port/
A place to celebrate the wonderful beverages.
(Previously there was a post here about recommendations)