Canon Power Shot Digital Camera

I purchased my first Canon Power Shot A510 digital camera about a year ago becuase I needed a digital camera and they were on sale at Walmart.I only used the camera for 3 days before it broke.Once I trurned it on, the lense would not come out of the camera.I returned it and got the same camera because I thought it must have just been the camera I bought.Well, the new camera I bought broke after 6 months of normal use.The lense comes out when turned on, but the lense protector on the end of the lense doen't open all of the way; it has to be done manually which usually smears fingerprints on the lense.It still works to this day, but is annoying to opperate and I have had bad experiences with two of these cameras now.Maybe that's why they were on sale???