Quick question about submitting signed cards to PSA

[Luke]

Hey Guys,

I am a PSA member, but I have only ever sent them baseball cards (no autos).

I have a ton of signed cards that from the steroid era that I am considering getting slabbed to make them easier to sell. I have looked at the PSA website and it is really confusing to me. I was expecting there would be some cheap specials, but I couldn't find any.

I know there must be ways to get cards slabbed cheaply, because there are a bunch of signed cards in PSA holders on ebay for $30 and below (like this one):

http://www.ebay.com/itm/JAY-BUHNER-M...gAAOSwd4tULRZd

I have a lot of cards like this one. Stars and HOFers that aren't worth too much, but I know it would be easier to sell them if they were authenticated.

Sorry for the long post. If anyone can tell how to do this, I would greatly appreciate it. Thanks!