How much could I get Mass Effect 1 for in store now? (UK GBP)?

I lost my old copy of mass effect 1 and wanted to play through it again, I want to get it quickly by not buying it online and waiting for delivery I since it's pretty old now I was hoping it wouldn'nt cost anymore that �15-20. How much could I get it for in GAME or GAMESTATION ? and also does the price of a game on GAMESTATION's website indicate the price of what it will be in store not just for online purchase?