Top to bottom they are: (on the same row the pair is exactly the same)
100 reis 1900 - 3.50€
50 reis 1900 - 4€
200 reis 1909 - 6€
100 reis 1910 - 4.50€
Postage is on the buyer but usually posting mail in Portugal is cheap so expect maybe just 2-3€ for a regular mail parcel. Also if you want to swap besides buying you won't pay shipping!
Regards,
Benny