Wanted: Man and lady’s second hand pedal cycle

My husband and I are hoping to be in Praia da Rocha on holiday from 13 January - 10 February and wondered if we could find two secondhand cycles to buy and use during our stay and then sell them before we depart.  We thought this would work out cheaper then hiring cycles for 28 days?  Unfortunately, we won’t know for definite if we will be travelling until nearer the time due to changing Covid regulations in UK and Portugal.