Where can I buy the glass component for the solar deck lights model number 711043

Have you tried Home Depot, that's their brand. If these lights are more than a year or two old, I wouldn't expect you will find the parts as they typically import the lights from China but not many replacement parts, particularly of this nature.

Have you tried Home Depot, that's their brand. If these lights are more than a year or two old, I wouldn't expect you will find the parts as they typically import the lights from China but not many replacement parts, particularly of this nature.+1
This pretty much sums it up. I would not expect to find parts outside of Home Depot, if at all.