You can adopt a Sealyham Terrier at a much lower cost than buying one from a breeder. The cost of adopting a Sealyham Terrier is around $200 to $500, which covers the expenses of caring for the dog before adoption and often includes vaccinations, initial veterinary checkups, spaying or neutering, and microchipping. In contrast, buying a Sealyham Terrier from a breeder can be prohibitively expensive. A Sealyham puppy usually costs anywhere from $1,000 to $5,000.