Their are shield shops all over Runescape. You should be more specific.
In North Falador near the fountain.
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An elemental shield is 845 gp.
The best shield for a non member in stat wise is the Rune Kite shield however if you want rarity the You can go for one with a trim in the colour of the runescape gods.
Sword: Rune 2handed sword. Shield: Rune Berserker shield 100.
the genral shop
A shield or a prayer book. sheild, book and 2h sword