While SidelineSwap defaults to the cheapest shipping option at checkout, we can certainly accommodate requests for expedited or overnight shipping.
If you're the buyer, simply make the purchase with the default shipping option. Either before or after you make the purchase, let your seller know that you'd like to upgrade to expedited shipping. Please then reach out to SidelineSwap support with the Swap ID so we can generate a quote for your quicker shipping options.
Once you've selected an option, we will charge your original payment method for the difference in the cost of the new label and let your seller know that the updated label is available to print from the swap page.
If you're the seller, please have your buyer make the purchase with the default shipping option and follow the remaining steps above.