Contact a transcript-ordering service, such as the company in the first link under Resources. To save money, though, you can also contact the registrar's office at the colleges and universities you attended. Most institutions have instructions for the transcript ordering process online, but you can call the registrar's office if you have questions specific to that school.
Download and print the transcript ordering form, if one is available on your university's website. If not, request that one be faxed to you. You can't complete the ordering process online, because you have to provide a signature verifying that you are requesting your own transcript.
Fill out the transcript request form, and send it to the registrar's office. Most offices will accept a faxed request for faster processing, but you may have to mail it, depending on your institution. Be sure to include your form of payment (credit cards will ensure the quickest processing of your request) and sign to verify your request. Also, include the address where you want the transcript(s) sent. You can have them sent to your address or directly to the human resources offices of your potential employers.