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I always use the Renfe website to buy directly.
It’s a bit glitchy and can be somewhat unfriendly, but I always buy directly from the companies and avoid 3rd parties as much as possible.
renfe.com
Renfe | Train tickets AVE, Avlo Low Cost (with No Booking Fees)
Buy cheap train tickets AVE, Avlo high speed Low Cost ✓ Timetables, Fares and Discounts ✅ No Booking Fees! ▷ ( Renfe.com )