May 18, 2015 by: This post may contain affiliate links20% Off Hummingbird Feeders – Prices Start at Just $9.99! Love hummingbirds? Then you’re in luck! Today, May 18 only, Amazon is offering 20% on Select Perky-Pet Hummingbird Feeders. There are currently six fun styles to choose from with prices starting at just $9.99!