I checked the Amazon marketplace, and the pickings are getting quite scarce for the GOUT. There aren't many sellers for the discs, and the prices have gone way up - $25 bucks a pop is the average even for a used copy. LFL must really be trying to bury these. For instance, the Tartakovsky Clone Wars discs have gone out of print as well, but there are many, many used copies available for really cheap - like $5 a pop. The lack of GOUT offerings tells me that LFL really wants these out of existence.
Now, they made a boatload of these discs when they came out, so they won't be "gone" for some time, but one might have to get creative to find them. I tried selling my GOUT copies to the local record store (yes, they still exist, and some of them are doing quite well), and they wouldn't take them because they had way too many on hand. Truth be told, there's not much value in the discs, and not because of the impending blu-rays. The high price and slim offerings seems like LFL is manipulating the market to make the remaining copies harder to get.