Samtian via Amazon offers the Samtian Speedlite Flash Professional Electronic Camera Flash Speedlight for $31.99. Coupon code "ZMXR3L6M" cuts that to $22.39. With free shipping, that's the lowest price we could find by $15. It takes 2.8 seconds to recycle to full flash and has a 7x flash frequency compared to a common camera flash. Deal ends June 30.