The Pricearchive app lets you see in a simple to understand chart how often and how much prices change on AliExpress. For example, which products have gone up in price this week? Which ones have gone down? How can you use it for your own purchases? Just paste the product page address into any search field on Pricearchive (like https://www.aliexpress.com/...) or enter keywords. Then study the chart and everything will become clear