I have just listed a large selection of antique and vintage postcards in my eBay store and am happy to combine postage costs.
All my postcards are sent in Do Not Bend envelopes to ensure safe delivery.
Please note - sometimes there are very slight variations in colour and tone between my scan, your screen resolution and the real postcard. Any faint lines seen when zooming in are from my scanner and not on the actual card. I do check each image to ensure it is close as possible to the postcard.
My ref: GR-7