JD sports do this ALL the time, all year round
they display items that arent actually available. when you click on them it'll just have a random size greyed out so you cant click it.
and now they have sizes you can click but when you try to add it just get an erro message saying cant add to bag or error or inssuficient stock.
its really annoying & i guess they just do it to make themselves look good so it looks like they had said item at reduced price when for most items i dont believe that to be the case.
surely there must be some selling law against advertising oos products at a reduced price.
rant over lol