Hello, I have 3 Blueair Air Purifiers for sale, all in near new condition. Model 503 & 403 suitable for larger rooms, and 203 perfect for bedroom or study. Filters have been replaced about 6 months ago, but not really used much since then. 503- RMB 4999 (list price 6,860) 403- RMB 3999 (list price 5,650) 203- RMB 2199 (list price 3,590)