Yeah, I know this is kind of late but maybe it still could help you out. The only place that I saw CRS in San Antonio was at Gabe's and that was about a year ago. Have not see any recently tho. As for amano's the only place I have seen that is Fintique. They have some from time to time. Usually, what I do is if there is a specific type of shrimp I am looking for I just talk to Ross (he orders there inventory) and see if he could get some in. Other than that I would recommend just looking on the shop and swap on here. You never know might get lucky.
Hope that helps.