Here are six ways to make the most of a site-wide TpT sale:

Use the categories on the left side of the page to find what you are looking for quickly!
Wish list everything ahead of time and get it all out of your system, then revisit and prioritize.
If a number of the items from your wishlist come from the same store, see if they are sold in a bundle. Bundles offer amazing savings even before sales, and unbelievable savings within them!
Purchase half of what you think you really must have (see tip #6 before doing so), have a look through your new resources, and leave feedback on those items [and any other items under ‘My Purchases’ that show up when you select the drop down tab ‘Needs feedback’]. Important: Previously purchased items may have been updated since you last downloaded them, so please be mindful of this when leaving feedback. Sellers are very diligent about updating resources. Leaving fair feedback will give you TpT credits that you can use towards more purchases.
Go to ‘My TpT‘ and see how many TpT credits you have. Do you have enough to treat yourself to something else from your wishlist? (It’s like magic, isn’t it?)
Use the savings code at checkout, wherever you are on the site, for maximum savings. That is TpT’s discount above that of individual stores during a site-wide sale.