Hi Sandy,
I also buy the one pound yeast bricks. Get 'em at Sam's club. Two for
three dollars plus change. Such a deal.
When I get them home they go right in the freezer. After opening the
first one I put it in a glass jar with a tight fitting lid and back in the
freezer it goes. I've had it last over a year that way and it's still just
like it was on day one, and that's just the first brick. The second pound
will also last over a year after it's open. I always proof my yeast before
using just to be sure. Old habits are hard to break.
Hope this helps.
Don