IPHONE 4 16GB WHITE on 3 pay as u go. ?

Hi, here i have an Iphone 4, 16 gb in white on 3 network. phone is in very good condition except for a hair line crack in top left hand side of screen, this doesnt effect the use or display at all and is shown in pic. im looking for offers above £280 so anything below will be declined. Thanks for looking.