3 X Alen Paralda HEPA Air Purifier including new filters. Price: RMB 2000 each or RMB 5000 for 3 (new unit price is RMB 4000). 4 X new Alen HEPA-Pure Filter Replacement for Paralda. Price: RMB 450 each or RMB 1500 for 4 (new unit price is RMB 500). 1 X Alen A375 HEPA Air Purifier. Price: RMB 2600 (new unit price is RMB 6000).