Yes. Elite attachments such as barrel extensions, magazines, and the nerf elite darts can be used interchangeably with an Alpha Strike blaster. But please do note that the Alpha Strike and Elite products carry totally different color schemes. So visually this cross-compatibility may not quite be appealing the eyes.
Nerf blaster prices keep changing based on the newest nerf gun releases each year. To check whether these blasters are available and their latest prices and discounts check Amazon here.