It always seems to me that the problem with scratch-building rolling stock, driving cars and other little projects is that you manage to buy six surplus bearings at the Model Engineer Show, design everything around them, then can't get any more. At this point you either re-design your super driving car or buy bearings retail (ouch!).
So, here are two boxes of brand new, old stock steel-caged bearings. There's one missing, so a total of 31, but they're highly superior Ransom & Marles manufacture, made in the UK (from the look of the boxes it was when we still had an Empire). All greased up, wrapped in waxy paper.