When the Raspberry Pi 2 hit the market in February, the company kept the $35 pricing of the preceding B+ model by making "production optimisations."
However, the Foundation says that a by-product of these optimizations has meant that the "lesser" model is cheaper to make too. Thus, its cost has now been cut to $25.
The upgrade to the ARMv7 processor in the Raspberry Pi 2 allows it to support Windows too. This broadens the appeal of the credit card-sized contraption considerably, and transforms it into a very capable machine that can do many of the same things a normal PC can.
While the Raspberry Pi 2 does offer six times more processing power and two times more memory than the previous "B+" model, now that the price has dropped it can be useful for tinkerers. There is still the $20 Model A+ available too, if you're content with even lower specifications.