You want to avoid rimless frames if you're on a budget. You can't stick any lenses in there. You need polycarbonate lenses to have the strength for the specs, it will be subject to stresses and strains. These lenses come up to about £140 depending on your perscription. And they don't come with hardcoat or antiglare coatings as standard!
If you were however to get a semi rimless frame then you can use the popular Oracle MAR 1.5 lenses which are a lot cheaper and more durable.![]()