Which smaller ISP in the US is able to resell lines from Comcast, TW, AT&T, and Verizon with nationwide coverage? I'm not aware of the US mandating lines be re

Which smaller ISP in the US is able to resell lines from Comcast, TW, AT&T, and Verizon with nationwide coverage? I'm not aware of the US mandating lines be resold at controlled costs dictated by the FCC, but I don't deal with consumer/eyeball networks so perhaps I'm missing something? From the frequent complaints I see about duopolies in most US networks, I'm quite skeptical of this. In metro Vancouver, I'm able to purchase 1G VPLS fiber links for around $800/mo, and dark fiber in the $1000-$2000/mo range for the most part, with similar pricing in Calgary and Toronto. Quotes I've seen in Seattle and Los Angeles have been typically 3-6x that range. I can purchase municipal dark fiber in Coquitlam or New Westminster (suburbs of Vancouver) for $400/mo, and I believe Montreal is $500/mo. I'm not aware of being able to buy metro dark fiber for anywhere near that anywhere in the US.