Real estate agent buyer comp?

[Matt Bastian]

Hello- My wife and I are new to real estate investing and are looking to purchase our first rental property, ideally a property that has been foreclosed on. Is it common for the buyers agent to charge a fee to the buyers? in this case 2.5% Many of the properties are possible short sales, but I was under the impression that the sellers pay the realtor commissions. 

Thanks!