I ordered recently from a place contacts cart. They sent me an email that they couldn't verify prescription, and had a link to a site that'll give a free online vision exam.
I actually placed the order with them (They were the cheapest, $17.20 for a box of 6.)
And received the following email:
"We've run into a snag in shipping your order! We reached out to your doctor, but unfortunately your prescription was not verified because it is invalid or expired.
In order to process your order, you can reply to this email and attach a copy of your most recent contact lens prescription if you have one from your doctor. Once we receive your valid prescription, we'll process your order today and get your lenses shipped out ASAP! We'll send you a confirmation email once we receive your prescription.
You'll have 7 days before your order is cancelled and refunded, so let us know if we can help in any way!
Thanks for choosing ContactsCart!"Do you by any chance have the link for that free eye exam?