My local Home Depot has 14 gauge solid THHN in a 100 foot spool, whereas Lowe’s only had it in 500 feet. The Home Depot also carries a lot more than Lowe’s. Lowe’s only had like three shelves of wire, whereas the Home Depot has an entire section full of shelves of wire. Lowe’s only has a few spools of wire to be custom cut, and I don’t think any of them were green, yet alone THHN or solid or 14 gauge.