Datel's Wii Pistol mimics the Nyko product right down to its light blue grip. The knock-off peripheral is advertised on Datel/Codejunkies' shop as "the ideal add-on for classic blasters such as Resident Evil 4 and Chicken Shoot." Classic? Chicken Shoot?!
The Wii Pistol is currently out of stock, but it regularly retails for $12.99, two bucks cheaper than the Perfect Shot (Amazon currently has it on sale for $12.99, though). You can compare Datel's clone with Nyko's shell past the break.