Wow. They sell gertrude's at my
LFS when they have them for $6 bucks. Must be lucky, but I have seen them online for $3 bucks not including shipping. Any of the blue eyed variety would be awesome for a 29 gallon though.
I haven't ever had shrimp but they are really cool. They have a red clawed shrimp?, with the gertrudes at my
lfs and they are really neat too.