What is the best selling promotional gift? It's a question we often get asked here at RT Promotions and I guess that's because we know a thing or two about the promotional gifts market. We see trends come and go, but here on this page, you'll find our 'evergreen' promotional gifts. They may not be new, but they are popular. Why are they popular? Because they're effective. Have a browse amongst our Best Selling Promotional Gifts.