Shipped via USPS, with tracking, in a bubble envelope,sandwiched between two pieces of cardboard OR in an Armalope for gradedcards. 

https://www.cardshellz.com/products/copy-of-armalope-lightweight-card-mailer-0-45-oz-single-pocket

https://www.youtube.com/watch?v=9HDhT7RvzyQ

I combine shipping on graded cards.  What I do is the following:  You pay for all of the individual card costsand shipping.  I package up the cards andgo to the post office and ship the cards to you.  I then REFUND to you the difference betweenshipping paid and actual shipping.  Forexample.  You buy three cards.  Total shipping charged is $17.97.  Actual shipping is $10.00.  I refund to you $7.97. 

Any questions, please message me directly.