Yes supply is available however most common is green jade, possibly white since it is still the older or middle aged generation that wears jade. Jade here is not quite trendy with young people (i mean in their 20s - 30s) like semi-precious stones or Tiffany is. Red, black is also favored but mostly as pendants or earrings, rings etc and I think, younger people who wear jade prefer the softer colours like lavender. I haven't really seen a "blue" one, I rarely see this on a woman who wears jade. As with any place, similarly in Hong Kong, Taiwan, Malaysia there is a lot of jade - we have street markets where vendors sell cheap jade, or nephrite, maybe even flourite , but being sold as"jade", mostly these are just very affordable fun pieces to have. Prices can be very cheap $50-200, just don't expect too much as you won't be getting top quality there. But some are really pretty. On the other hand there are the generic jewellery stores which sells gems, also carry a small section where they sell jade, another member here just mentioned above, that their jade is just "ok" and I think she's correct on that point. A number of jade specialty stores exist here, and these tend to be multi-generation or business that have been in business for decades and are masters of their trade. The jade is top quality, very well cut and prices could well burn a hole in your bank account for a number of years. Bangle maybe is in the range of $3k - $10k and $20k for very special ones.
There is some growing interest in young designers to incorporate jade in their jewellery. Examples are the 2 pictures I earlier posted. They use jade that is probably decent, not top quality but the focus of their design is traditional with modern interpretation. This could well attract a much younger crowd who find traditional jade very boring.