hi

i sold some fashion earrings for $5- and charged $4.25-registered post

you can buy the registered post envelope at the post office and post small thin items in it

i just put cardboard on either side of them done it twice and no issues as long as its under 250gm and under

5mm thickness no issues and it covers you for paypal as they have to sign for it and it can be tracked on aust post site

tara