I ordered 2 packs of 10 WR / TR outdoor GFIs from Amazon at about $7 per outlet, so didn't seem that bad considering they also come with a decorative plate to hide the screws:

I ordered 2 packs of 10 WR / TR outdoor GFIs from Amazon at about $7 per outlet, so didn't seem that bad considering they also come with a decorative plate to hide the screws:
