The Steam Deck is sold exclusively by Steam itself.
By foregoing sales through retailers like Amazon, Saturn, MediaMarkt, and GameStop, Steam can save the 30% markup that these companies would normally charge. This allows Steam to offer the Deck at an affordable price.
Another reason for the availability of the Steam Deck is that purchasing the Deck requires signing up with Steam and there was also an option for customers to pre-order it. This led to a waiting list that moves slowly and thus ensures the availability of the Deck.
Accessories for the Steam Deck
Although the Steam Deck itself is not available in retailers like Amazon, Saturn, MediaMarkt, and GameStop, customers can buy accessories for the Deck there. On our Steam Deck Accessories overview page, we have compiled the best accessories currently available, including things like protective cases, spare parts, and even special attachments for the Deck.
Conclusion
Overall, the sale of the Steam Deck is an interesting decision by Steam that allows them to offer the product at an affordable price while also ensuring availability. There is also a selection of accessories for the Deck that are available in retailers like Saturn, MediaMarkt, and GameStop. So Steam Deck users have plenty of options to customize their Deck to their needs.