Champion Party Supply has moved to Georgetown! Our new address is 6516 5th Pl S Seattle, WA 98108. For over 80 years, Champion Party Supply is Seattle's premier destination for all things party and costume, including full-service balloon services. At 10,000sf of retail space, we boast the largest selection of costumes, accessories, wigs, theatrical makeup, party supplies, and balloons in the city. We have free parking available to our customers in our private lot and attentive staff to assist with your every need for your upcoming event or party.