The main reason for doing the preorder of sealed Magic: the Gathering products and single cards is to securely acquire the cards first-hand on their release dates. For my take, I did some preorders so I could do an unboxing video for each of them and also as an update for my YT channel. New unboxing content perhaps?
Recording them as you do the opening is quite fulfilling to value that moment that you had the first cards of the newly released Magic: the Gathering set. It may not be the case though if the products are delayed but yes, the main feature is to have them recorded for the first opening experience.
A few of the local game stores have their Streets of New Capenna Preorders posted on their hobby shop website which their customers can check and transact. One example is the Block 101 Hobby shop where they have a segment on their website & online store for the new set’s cards and sealed products. You can sort them by date and price from highest to lowest and vice versa.
You can check out this short video below on the Pre-order setup at the Block 101 Hobby shop website.
Single card components especially the Mythics may appear to be pricey depending on their use, but that is the purpose of it. You will need to pay extra to get the cards at the first release. It is a risk to buy some of the high-priced cards as the market price may not yet stabilize on the release date. In my case, I usually check for the low-priced cards that may have potential in Standard and buy a playset of it if possible. It is more of a miss as revealed per the previous sets but the money loss is tolerable. I was still able to sell some of them after the rotation.
Aside from the pre-orders, you might want to join a local Prerelease of your fave LGS or just some hobby shop nearby that is hosting the event. Neutral Grounds is the biggest chain of LGS currently in Manila and nearby provinces, so you have a lot of options to choose from based on your location.