I need some info as well. I am on the Northwest side of town and my normal provider is not open on Friday. I am looking for a sack for tomorrow night and will probably try HEB and Fiesta. I can let you know what I find along with price and size.
I have been getting cooked crawfish at this place in Texas City. Size was increasing each week. I know its not Houston but I just thought I would share. They usually get about 5 or 6 bags on thursdays each week.
On the North Side, you might want to check out Blue Water on 1960 (Just East of 249). They sell live and I have heard good things. Not sure on the sizes right now./