There are "variants" of LLU that allow ISPs to install their own equipment in the ILECs central office buildings, which would allow the ISP to utilize their own

There are "variants" of LLU that allow ISPs to install their own equipment in the ILECs central office buildings, which would allow the ISP to utilize their own equipment on both ends of the line (CPE and DSLAM). It is rare, though, and incompatible with Vectoring for example. Most xDSL ISPs just resell service and the ILEC uses a L2 VPN to route traffic from the DSLAM to the core network of the reseller ISP. Price is rarely lower, usually only with bundles such as IPTV or landline with cheap international calls...