Can bikes have review mirrors?

I know it's a silly question but I'm new to biking (not motorcycles I mean regular 10 speed biking) and I get nervous riding in traffic (although law in my state says I have to and cannot be on the sidewalk). What makes me most nervous is going around parked cars or piles of leaves in the bike lane since I... show more I know it's a silly question but I'm new to biking (not motorcycles I mean regular 10 speed biking) and I get nervous riding in traffic (although law in my state says I have to and cannot be on the sidewalk). What makes me most nervous is going around parked cars or piles of leaves in the bike lane since I can't see what the cars are doing behind me. I'm not confortable turning around because I'm so new to biking I'm afraid to take my eyes off what's in front ot me. Can a bike have a review mirror? Where can I buy one?
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