Hi graygirl61,
If you have lowered the prices of eBay store items, you will need to file a support request for assistance with updating those prices. All other price changes should be updated automatically according to the following approximate schedule:
Our listing maintenance, which updates title, current price, high bidder, high bidder feedback, bid count, currency, and end time on your active listings page is done about every 6 hours.
Once your updated prices are reflected on your active listings page, they should be displayed in your store window the next time it refreshes, which it does about every 2 hours.
-Mike