It's all good, man. You CAN buy blue diodes now, they are commercially available in 473 and possibly even 488nm now. Really expensive and not being mass-produced, but very available. Green diodes, on the other hand, are not commercially available, because they don't really exist.
A review for everyone of what is *generally* available for handheld lasers/pointers:
Available in single mode diodes:
IR - 808nm, hundreds of mW in 5.6mm cans readily available.
Red - 650nm, 300mW readily available in 5.6mm cans.
Orangish red - 635nm, a few tens of mW available in 5.6mm cans.
Violet - 405nm, 200mW or even a little higher readily available in 5.6mm cans.
Blue - 455nm, 473nm, and other such wavelengths, variable powers available in 5.6mm cans, but only through special order from manufacturers at huge prices.
Available in DPSS, in order of decreasing availability/increasing price
532nm green
473nm blue
593.5nm yellowish/orangish (depending on your eyes, basically)
And others, but these are generally what you find in laser pointers.