These guys do really cheap cases if you need a few spare ZY Pop Electral Fun Store. Otherwise just hunt around for stores that offer free shipping (that's often more than the cases).it came with memory foam and i'm not used to it.
also, the audacity to sell iem that only comes with lint-magnet memory foam tips and didn't even include pouch or case with the iem.
The trick with foams is to roll the tip between finger and thumb to compress it before putting it in your ear. Then they expand out for a good seal. Good memory foam tips remain compressed for longer which makes them easier to insert. TENNMAK do great foam tips, I have no idea how good the new KZ ones are in comparison.