Eiswein from Germany or Austria are wonderful (my most recent experience was a 2014 Grüner Veltliner Eiswein, which was so unctuous!), but they are not cheap. One of my favourite Sauternes ‘substitutes’ though continues to be a good Montbazillac. Excellent value for money - and all the flavours you would expect from a botrytised wine.
This one from the Society is phenomenally good: