I fly for SWA, commute from OKC to HOU and haven't bought a hotel in months. YMMV but there are plenty of commutable trip opportunities from OKC at Southwest. They won't fall into your lap, but even as a junior FO you can spend very few extra nights from home commuting if you don't mind flying PM trips and play your cards right.
If you look at bases with good frequency and a late flight home (HOU, sometimes DAL and DEN) it can actually be quite easy.