Its like that everywhere now, hard to even get pig brains anymore from a market. Luckly we kill a lot of pigs here and save the brains, exotic deer brains as well, since the Axis deer hides are usually sent to a broker for rugs, but we use the brains from them as well.
The other option is to "Brain Tan" using tanning oils like Protal or similar types of tanning oils. Any oil that will mix with water will do just as good a job. The important part of course is wringing the luiquid thru the hide so all the fibers get coated and then broken down.
I know a couple of tanners that use cod liver oil, or other fish oils and they put out some very very nice hides.
The only problem using something other than brains is that it costs a little bit of money for the supplies, however it takes the CWD and MCD out of the picture.