This subreddit is nice for looking for deals on computer parts and accessories. Not all of them are the best deals, so it's easy to waste time on here. I recommend checking it out before you buy your part. For example, if you search "RAM" and sort by newest first you might find a deal! I saved some money, but I check everyday so I feel like I wasted wayy more time than it was worth, so maybe don't do that! It's also a good place to post a deal if you do find one!
Have a good one!