After my beloved HA-FX33B 'phones broke, I picked up a set of the HA-FX35B for what (in Canada) passed for a good price (under $20), since I couldn't seem to find more 33's anywhere... and was disappointed. First impressions were that the cord was thinner and the plug wasn't as nicely molded onto the cable. They were harder to grasp and stuff in my ears, and finally, they did not sound as good.
Looking more carefully, I've found HA-FX34's at a couple of stores, mostly in bright colours, but exactly one set in black. Without opening the package, they closely resemble the 33. Not attractively priced, so I didn't take a chance on them. I explored the (low-turnover) electronics section of a department store, and was surprised to find a bunch of HA-FX33W, priced at what presumably passes for "list" in Canada (about the same as the various 34's).