OP,
Totally agree: so frustrating that good eye moisturisers often don't have spf, which then means paying ridiculous amounts for 2 separate products. 
Possibly it's due to an increase in extra sensitive skin surrounding eyes reacting to the spf ingredients themselves? Or customers complaining they end up also having to buy a non-SPF-containing eye cream solely for night use?
A surprising amount of friends don't bother with everyday eye SPF.
I've got very fair, hypersensitive skin but have found that Clarins UV Plus SPF50 is gentle enough to use even on eyelids.
It comes in stupidly small bottles (30ml), but it lasted me months. The outlay's steep at (IIRC) approx £28ish, but is economical when combined with first applying a reasonably-priced yet decent eye cream (usually the Body Shop Vitamin E one) for the moisturising benefits.
I just add a tiny dab of the Clarins in the morning, and re-apply if necessary later in the day. I've found its non-greasy, silky texture works as a primer, isn't chalky and can even be patted lightly over eye shadow for invisible touch-ups!!
(As someone who once suffered sunburnt eyelids, when I dared lift my sunglasses for all of 5 minutes, I've got seriously high standards with regard to sun protection in that area).
Good luck...I'll be interested to read other posters' recommendations and ideas.