/r/bicycling and /r/whichbike should be able to help.
Don't buy a department store bike unless you want it to fall apart in 3 weeks.
Get a good bike lock for your next bike. Cable locks can all be cut with bolt cutters in 5 seconds. You need a U-lock; something like this at minimum, this is better, and I have this which is one of the best locks available. Learn how to use your bike lock properly.