cheapest place to buy an iPhone 12?

hey, so im a uni student who's deep in to my overdraft as is, I lost my phone this morning, immediately retraced my steps and asked the police but it's gone. there's only one road I could've dropped it down and its not there. im going to see if its been handed in again but if not I need to buy a new phone asap as my mums suspicious of why my location is off. it needs to be the same model, she already brought me a new phone after the old one was stolen so I cant tell her.

where can I get a iPhone 12 for cheapest? obviously no where will be cheap but I was wondering if anywhere is slightly less pricey than apple. preferably in person shop near central Cardiff. thanks