You can try e-bay but they've already sussed out the Secret Santa market. More fun searching 'unwanted secret santa' or 'unwanted christmas present' in the New Year - some great gifts including unwrapped ones where, for example, there has been a fall out. A friend in Edinburgh bought a Hearts bobble hat for a hibies fan as a SS (think he got confused), but perhaps that did not get as far as e-bay and was used to keep warm instead (on the fire)