Some good deals and in stock on screwfix clearance. Reduced from £20.42 this is one of the ones that stood out as it includes a decent case, and 1000 screws. At less than 1p per screw it's the cheapest I've ever had...
Most stores have these in stock but if you need it delivered then if you do spend over £25 there is a free delivery code at the moment ( FD25MAY )
There is another reasonable deal here with a metal case http://www.screwfix.com/p/quicksilver-handy-trade-screw-plug-case-2000-pieces/79910?cm_sp=Landing_Page-_-Clearance-_-79910
but that comes with a number of wall plugs so isn't such a good deal in IMHO
Hope this helps someone