There is a link for a non-member submission form on PSA website.
http://www.psacard.com/submission_ce...onmember.chtml
If you plan to grade 6 or more cards, the membership is cool because you receive a hard copy subscription to the SMR for a year. It's not Old Cardboard, but practically free if you sub 6 six cards.
I use PSA because it's about 30 miles from me which equates to lower "raw cards in the mail" induced stress.
I agree with above posts, SGC holders look better and in my opinion, hold the card better. I plan to use SGC for the first time, sometime this month.