To find Reddit coupons for specific brands or products, explore relevant subreddits dedicated to deals or specific product categories, and subscribe to brand-specific subreddits where exclusive coupons may be shared. Utilize Reddit's search function to look for keywords related to the brand or product along with terms like "coupon" or "discount." Additionally, keep an eye out for promotional threads or announcements within relevant subreddits, and engage with the community to discover valuable coupon codes shared by fellow Redditors. By following these steps, you can increase your chances of finding Reddit coupons tailored to your desired brands or products.