I've found 9 18-30 somethings tours

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Tour Operator Included Price Compare
Zagreb to Dubrovnik: Parties & Plitvice Lakes
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6 nights
£719pp excluding flights
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Members are eligible for cashback on this trip of up to £14pp
Essential Southern Balkans
operated by
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8 nights
£930pp excluding flights
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Members are eligible for cashback on this trip of up to £19pp
Dubrovnik to Athens: Beachfronts & Fortresses
operated by
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8 nights
£971pp excluding flights
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Members are eligible for cashback on this trip of up to £19pp
Budapest-to-Split Rail Tour
operated by
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13 nights
£1279pp excluding flights
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Members are eligible for cashback on this trip of up to £26pp
Zagreb to Athens: Adriatic & Ancient Capitals
operated by
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14 nights
£1556pp excluding flights
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Members are eligible for cashback on this trip of up to £31pp
Best of Balkans | Start Dubrovnik
operated by
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14 nights
£2627pp excluding flights
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Members are eligible for cashback on this trip of up to £53pp
Dubrovnik to Santorini: Croatia Highlights & Greek Island Hopping
operated by
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14 nights
£2141pp excluding flights
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Members are eligible for cashback on this trip of up to £43pp
Bohemian Europe Rail Tour
operated by
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20 nights
£2089pp excluding flights
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Members are eligible for cashback on this trip of up to £42pp
Croatia to the Greek Islands: Zagreb Nights & Santorini Views
operated by
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20 nights
£2699pp excluding flights
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Members are eligible for cashback on this trip of up to £54pp