In short
An expired domain can be acquired in several ways: via marketplaces and auctions, by direct purchase from the current holder or — if it is not yet free — via a backorder on the re-release. Which route fits depends on the domain’s status and the TLD. Vetting always comes before buying.
Acquisition routes
- Marketplace/auction: already-traded domains at market or bid prices.
- Direct purchase: approaching the current holder.
- Backorder: if the domain will soon become free (see backorder).
Costs & timing
Prices range from a few euros (fixed-price marketplaces) to higher amounts for sought-after names. For context see What does catching a domain cost?
Vet first, then buy
Check history, backlinks and legal status in advance — see vet and risks.