Where can I buy "curly oregano"?

My mom mentioned that she once tasted a variety of oregano called “curly oregano” and thought it was fantastic – she has looked for it ( to grow in her window boxes) but hasn’t been able to find it anywhere. I thought I’d try to find it for her as a gift but my online searches have not worked. The one store I found that had it listed in their online catalog didn’t have it in stock once I tried to order. It’s apparently also known as Origanum vulgare Aureum Crispum. Anyone out there have suggestions or any experience growing this type of oregano? (and yes, I know gardening season doesn’t start for a while, but I thought getting her the seeds now would be a nice gift).