jor forget the padlocks and go and get yourself a straightforward cylinder like a yale,era,union,bird etc all of these can be got for £10 or a lot less and can all be rekeyed. Pop into your local locksmith as they should be cheaper than a diy store and you may even get a few other bits thrown in if you tell him why you want it and are very polite
ps i only gave this advice as we dont see as many rekeyable padlocks over here in europe as some as our transatlantic friends do
