Eiertante.com is an online flea market for collectors, presented as the shop of Bonsaipanther. It specializes in collectible figures and toys, with a particular focus on Kinder Surprise eggs and Ferrero items. The catalogue also includes figures from other brands and licensed series, as well as toys, school supplies, music and film memorabilia, PC and video games, antiques, art, and home décor. Shoppers can browse new and general listings, search the catalogue, and find information about prices, shipping, payment methods, and returns.

The site also shares news and information about collectible surprise-egg releases, including character and toy series, special packs, and seasonal products. Recent examples mentioned include figures inspired by Hello Kitty, Disney, Playmobil, Minecraft, Jurassic Park, Star Wars, and other familiar franchises. Individual items are listed for sale, including figures and small toys with displayed prices. The shop advertises a 25 percent discount on all items for orders with a minimum combined value of 12 euros; customers are asked to wait for a separate email confirming the total, including shipping costs.