I want a dairy cow under my budget.

For dairy, choose a Sahiwal, Gir, HF cross, or Jersey cross. If your budget is tight, a good crossbred or Sahiwal is often the safest buy. First milk the cow in your presence, then do a CMT test on all four quarters, check the lactation month, body condition, and age. If the cow is above fifty thousand rupees, take a Pashumitra or vet with you. If you want, I can help you shortlist by budget and milk yield.