Boxster S Coil Spring Options
 

I have a 2001 Boxster S that is currently riding on H&R lowering/sport springs and I would like to put it back to stock height. I haven't been able to find much for options besides buying coils from Porsche. I'm hesitant to buy used springs cause there's no way to know how many miles they have on them.

What would you guys recommend?

I think you've answered your own question. The only way to guarantee zero mileage is to buy new springs directly from Porsche.

The saying goes - never buy used suspension. I have learned from my previous mistakes and I stand by the saying.

Elephant Racing has the Euro S sports springs.

I would definitely buy used. In fact I have been on a set of used springs for 4 years that I bought for $50 or $100 from this very forum. Just make sure they aren’t corroded. The guys on the British 986 forums frequently have them corrode and fail.
Otherwise, the metal quality on these is good enough you don’t have to worry about sag. I don’t even want to know what a new set would cost.
Other suspension components would warrant more caution but springs are pretty safe. You can tell how many miles on them by asking the seller or looking at the odo if it’s a wrecked car.

This year I've bought a set of M030 springs for my boxster (it was on base springs) and I didn't find them expensive from the Porsche dealer. About the same price as a set of Eibach springs.

As far as I was able to trace back, the M030 sport springs will make it sit about 1cm lower than the base springs. That's fine for me and a lot better than the 3cm given by Eibach, H&R and the like.