The coupon price for ESP32 CAM Development Board with OV2640 is $10.99 (in Banggood). Just check coupons out (with price alert and history). You probably want to know what is the best price?
RAM internal 520KB + external 8MB PSRAM, SPIFlash default 32Mbit, Working voltage 4.75-5.25V, Wi-Fi 802.11b/g/n/e/i
Latest coupon and price update (UTC):
Banggood ($10.99)
Banggood warehouse is located in China. As you can see I didn’t find any active coupon for this product right now… Is it a reasonable price for this item? This price is higher than average price ($9.18) for this item.
Link: Banggood product page
Price: $10.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGJUNEGSG9, TTSUMMER8, Cuponation9, 9OFFSUMMER, BG00c906, BG589b2e
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Check out price history chart (for all/most countries) for ESP32 CAM Development Board with OV2640.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).