Cheap Computer Equipment

Hello people. I need to buy a Usb flash drive or pen drive that has analog protection. By analog, I mean not digital. Like a six dial combination lock on the body of the pendrive. Ofcourse, there are softwares to encrypt files. But all of them can be brute forced. So, I'd like something external or hardware based.
I actually failed to mention my requirements. I know about AES and Truecrypt. That is a good security but too unconvinient. Because I'll have to either decrypt or mount the drive. That is troublesome because for that I'll have to start the decrypter program. I know such programs can be portable but that doesn't help. I want something like this- either a simple popup message telling me to enter password and no time required for decrypting OR a hardware method. I ain't gonna run a seperate exe first.