I've found 10 18-30 somethings tours

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Tour Operator Included Price Compare
The Great South American Journey: Quito to Rio Adventure
operated by
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64 nights
£6191pp excluding flights
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Members are eligible for cashback on this trip of up to £124pp
The Peruvian Coast: Seafood, Sandboarding & Dune Buggies
operated by
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4 nights
£431pp excluding flights
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Members are eligible for cashback on this trip of up to £9pp
Peru: Inca Jungle & Rainbow Mountain Trek
operated by
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6 nights
£919pp excluding flights
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Members are eligible for cashback on this trip of up to £18pp
Peru: Ancient Cities & the Andes
operated by
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13 nights
£1503pp excluding flights
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Members are eligible for cashback on this trip of up to £30pp
Real Peru
operated by
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14 nights
£2205pp excluding flights
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Members are eligible for cashback on this trip of up to £44pp
Quito to Lima: Surf Towns & Hot Springs
operated by
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14 nights
£959pp excluding flights
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Members are eligible for cashback on this trip of up to £19pp
Lima to La Paz: Sandboarding & Sunsets
operated by
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20 nights
£1919pp excluding flights
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Members are eligible for cashback on this trip of up to £38pp
Quito to La Paz: Amazon & Ancient Cultures
operated by
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34 nights
£2783pp excluding flights
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Members are eligible for cashback on this trip of up to £56pp
Lima to Buenos Aires: Deserts & Dancing
operated by
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34 nights
£3279pp excluding flights
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Members are eligible for cashback on this trip of up to £66pp
Lima to Rio: Coast to Coast
operated by
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50 nights
£5175pp excluding flights
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Members are eligible for cashback on this trip of up to £104pp