If you don't already have a scanner and only want to scan on far apart occasions, don't trhow your money on one. Scanners are great but if you don't need one you don't need one.
Copy centers will scan for you, for a dollar or two. They can put it on a flash drive (if you don't already have one THAT would be worth your money) or maybe burn a CD-rom to carry it back. E-mailing it to you is probably also a possibility.
To post it here, you have to upload it to the net. You can create an account on Photobucket, Imageshack or whatever image host seem trustable to you. They'll provide you with a "direct link" address for every image you upload, and when you click the "add image" button here, you'll just have to post your address in the box.
That's also how it works on most forums, not just here.
