I got my Goggles in Asda, my instructor was impressed with them.... though it took me longer to explain that you can buy that kind of thing in a supermarket than it did to tell him how little they cost!!! I Also got my ski jacket there (I'm small so could fit into kids age 16 - not VAT). And my gloves - also good quality apparently!
If you're boarding googles would be better (unless it's a really hot day) particularly if going in powder as glasses are pain to clean if you get snow on the inside. Googles also keep face a lot warmer. I normally take both out but use googles for boarding/skiing and only wear the glasses when sittign outside mountain cafe scoffing my spag bol.