Perhaps wary of stock levels, Apple has put the iPad mini with Retina Display on sale overnight with pretty much no fanfare.In fact, you can potentially have one before the week is out, with Apple promising shipping of some of the models in 1 to 3 days. Not bad for a product that was widely expected to be in extremely short supply during the festive run-in. Our advice? If you want one, get one now.Sadly, you can only get certain models of Apple's miniature tablet. The entry level 16GB model is available for for £319, with the 32GB version also on the site in either of the two colour options, that one selling for £399.If you want a larger storage capacity, you can order the 64GB model (£479) or the 128GB iPad mini (£559), but both are down for 5 to 10 days provisionally. If you want 4G on any model, you are looking at £100 on top and the 5 to 10 days timescale.If you want to know all about the new iPad mini and its Retina Display, read all about it here.