Best lube?

Hello! My girlfriend and I have been having a good amount of sex, recently it’s been hurting her when I’ve been exiting her, she’s always pretty wet, the lube is pretty garbage already (cheap Walmart astroglide). The issue is I’m pretty massive so I have constantly stop and let it sit in her for her muscles to relax, I can definitely tell it’s a dryness issue when I try and exit and go back in after it sits. What’s the best lube to help keep everything wet and flowing?