Plus size cycling shorts

Sports Authority had a brand that ran about 40.00 but didn't look like they would fit.

I'm a size 20 right now and don't know my sizes or brands.

I rode yesterday and today for maybe 20 minutes each and the oh so familiar (but I haven't felt it in 20+ years and 100 lbs ago) pain in the pelvic bone/butt area is haunting me.

What do you guys recommend? Is there a forum on here that has a used/wanted section?

I buy alot of my bike clothes from here:
http://www.teamestrogen.com/

They have a pretty decent plus size section....and the clothes fit!  plus some of them are really cute to boot!

Skirt sports has some really cute stuff.  They have bigger sizes too.  REI carries skirt sports too and has cheaper shipping.  Don't buy too much though, you probably won't wear them too long.  I have the skirt sports running skirt and tri suit and love them.  

Check out E-Bay
I bought my first couple pairs there when I was much bigger.
You can get brand new and there are a couple vendors that carry up to 5x size.

Here are a couple examples:
http://cgi.ebay.com/Mens-Classic-Bike-Shorts-Padded-cycling- short-5XL-BLK-/170294255426?pt=US_Men_s_Athletic_Apparel&ha****em27a6541f42

http://cgi.ebay.com/Century-Thick-Padded-Bike-Shorts-WOMEN-C ycling-short-5X-/170284726769?pt=US_Women_s_Athletic_Apparel &ha****em27a5c2b9f1