What I'm going to say is not at all against your girlfriend, but I find amazing that you could buy pantyhoses for 1$ that are single use. The amount of waste must be staggering.
I never really put much thought into pantyhose during my life, and I just assumed they costed $10 and lasted a long time like a pair of socks. I didn't realize 1-2 wears is normal. It is a huge amount of waste as you said.
Nonetheless, I don't think $150 pantyhose is the solution. My girlfriend can have three different thicknesses to choose from in her closet for $3. She's not going to pay $450 to have that same level of selection. I think the price needs to come way down from $150 to $25 to make sense.