Bitcoin price to day is currently around 8,500 usd, and for the past week bitcoin price is playing from 8,500 to 9,000. If what you are asking is, what is the good price to buy bitcoin right now, then i could say lower than 8,500. I could be wrong but from what the chart is showing right now, i dont think that bitcoin price could get any lower than 8,000 anytime soon.