Some sellers highlight the cheapest accessory to entice you to click, but to see if the ballpark price for it actually goes around that amount, scroll down to the recommendations and go see the same product from different sellers. If so, you can still score a lower price by adding it to your cart and letting it sit there for a while. Go back to the homepage, refresh, see the same product at a different price (sometimes from the same seller, further price drops won't update YOUR cart, you will have to add it again, but same goes for a price raise; at one time I had in my cart a lower price locked, saw the same item at a slightly higher price from the same listing, added it and my item got the updated price)
Also, some big sized items for my country (I was shopping for replacement taillight housing for my car), may have a high shipping fee for the whole month except Choice days, where they also get a discount.
Use the visual search or use "find similars" by tap-holding a listing.
These guys are masters at algorithmic pricing, and they make it addictive. I'm hooked. I love that site, the games, the juicy coupons, everything. I will keep giving them my money.