I've been looking for a pair of sunglasses that I can wear over my prescription glasses, but cannot find any that are the right size or shape for my small oval glasses which measure about 5" x 1". Does anyone have suggestions as to where I can find a pair and also other brands of fitover sunglasses.

Presciption sunglasses are out of the question as I do not have the money to splurge nor do I wish to have to replace the lenses every few years.