Can I get a bus pass to travel around macau for 2 1/2 days tour and how much is the cost?

Of course. The Macao Pass will do. It can be bought at the Customer Service Centers of the Pass, and some convenient stores like 7-11 and OK. The card itself costs 30MOP and you should deposit at least 100MOP for the first time. In a word, you need to pay 130MOP if having a new one. However, the bus fare is quite cheap in the city. Only for 2.5 days' stay, paying cash may be a better idea.