That is a good question?  I'm thinking that you could buy as you many as they have available for the sale! This is what is on the website, I'm not sure what the max is? https://unilot.io/en-us/

Token Sale Cap   25 000 000 UNIT tokens
Currency Accepted ETH
Bonus 40%
Exchange Rate    1 ETH = 12 658 UNIT Tokens + (40% bonus)
Minimum Transaction   1 UNIT Tokens (0.000079 ETH)
Maximum Transaction   379 746 Tokens (30 ETH)