Combined postage 75p is available for any number of items sold at the same time with individual item postage from Free to 75p.  But please ask for invoice, the only way of now doing this now is via the link in your order Basket to the right of my ID awa.uk.vr88b3g, as guide I show the eBay link in photo 2.  I'm happy if you do this multiple times prior to payment in a big order, it reserves your choices so noone else can do so.  Lots of other interesting transport items can be seen via the link in my Seller Information above.

Private seller, net proceeds go to the considerable cost of my collection including getting these in the first place.