Combining PDF Files??

Hello, hopefully someone out there has a solution for me. I only have a version of Adobe Reader that I downloaded, and I need to combine 2 different PDF Files. What is the easiest and cheapest way of doing this? Any help would be appreciated, thanks!

 

Thanks for your help and wonderful offer. Unfortunately, I will need to find something permanent to combine pdfs because I will be sending the docs out monthly. I tried the cutepdf program and it works pretty well. The only thing with that eval program is that they advertise with a link to their site on the first page of every doc. But I can get around that for now... however, I'm still looking around. Thanks again!