If you are looking for specific imagery, you can find niche packs at retailers like Etsy and Amazon : Variety Pack of Postcards - Etsy
Includes 28 unique, high-quality prints with bold, colorful floral designs. These are specifically designed for those looking for an "elevated" or "artistic" aesthetic. Blank Postcards for DIY & Art buy postcards
100 Pcs Vintage Postcard Set,post Cards For Mailing 4x6 Retro Style eBay - jabust-9 Go to product viewer dialog for this item. If you are looking for specific imagery, you
A massive variety pack featuring 100 unique designs of plants, animals, and butterflies. These are printed on thick 305gsm cardstock with a matte finish, making them perfect for both mailing and wall decor. A massive variety pack featuring 100 unique designs
A bulk set made from 100# felt cardstock, which has a subtle texture. The back includes a standard horizontal postcard layout, making them ready for immediate mailing once you finish your art. Buying by Theme
A specialized set of 30 heavyweight (300gsm) cards designed for wet media like watercolor or ink. They come with 30 envelopes to protect your artwork during transit. Blank postcards 50 pack Plymouth Cards Go to product viewer dialog for this item.
Wanderer's Voyage Postcard Set: Pack of 30 Retro Style Travel and Transportation Postcards michaels.com Go to product viewer dialog for this item.