If you just order directly, you will get all the orders piled together as one shopping card, and pay a single time, but it will effectively be all those orders added together (which is why shipping would look really high). You would then receive individual orders from each seller separately.
You can look into the Sportlots Box option, where you order the same way, but have all the orders sent to Sportlots, where they then box all the orders together and ship them to you as a single shipment. Theoretically it is supposed to be cheaper for the buyer that way. It also allows you to make several orders over time and have them accumulate before having them shipped from Sportlots.
I think with the Box option, you get a notification from Sportlots as each seller's shipment arrives at the Sportlots facility.
Sportlots Box Overview - YouTube