When I was updating this page, then coupon price was 47.75 USD for Manual Hand Crank (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Latest price update (UTC time):
Banggood (47.75 USD)
Banggood warehouse is located in China. I’m afraid that there’s no working coupon in Banggood. What about the price? This price is higher than average price (27.39 USD) for this item.
Link: Banggood product page
Price: 47.75 USD
Old coupons (from the oldest to the newest): 59e292, e7afa2, aff7off, 502C6B, f383d7, AFfbG10, BGIPRee12, BGVDay10%off, BGCP24, BGCP3343, BGCP363, bGhOnEy10, 21322a, BGIPR8, f4fab6, BGODFN1, BGEUOD1, BGZPBC15, BGTY704CP, BGCuponation10, BGTY503DL, BGHONEY2110, BG10OFFAFF, BGwhielabel, BG022e68, BGc2d7a9, BG0b82e2, 13f142, BG10OFFAFF1, BG4d9120, BGAlerabatod, BG1336d3, 00c906, BG00c906, BG49dc65, BGe46870, BG7280ff, Tabby20, BGc8c272, BG36e006, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, BG2bb7a1, BG8ReviTrage, Cuponation9, BG26848f, BG073996, BGc363fd
(I don’t think these’re gonna work, but you can try ’em out anyway)
Aliexpress
Click here… to search for Outdoor 20W Manual Hand Crank Generator on Aliexpress
Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for Outdoor 20W Manual Hand Crank Generator is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).