All those drives are available here, but there are very few importers, little stock. It is expensive to buy via retail, so all the guys like me manage to get access to the importers/distributors, thus saving 10-30%. For example, the NEC 3500 retail is $130! The DW1610 retail is $92!
Media is my biggest problem. There's a lot of trash here. Verbatim is the only top quality media available, but the product range is limited and expensive. 2.4x dvd+r dl 5 pack is $67. 8x dvd+r verbatims are available... at almost $1.70 a piece :(.... no 16x around yet. So you get the point, its damn expensive here! I think the importers just make huge mark-up and there is a very small market... although 40million population.
If I could manage to import some Taiyo Yuden media into the country, then me and a few enthusiasts would be very happy, but the shipping costs usually outweight the package cost!