Sudoku fan enjoys birthday gift

Dear Mr. Tan,

I am the mother of J, a Guest Service Manager at H Kuala Lumpur.

Yesterday was my 53rd birthday and she presented two of your Logic9 (Vol 4 & 5) to me. I just love it and keep doing it on the bus journey from K.L. to Port Dickson (on a day trip with some senior citizen).

I would like to say thank you for the gift, which I really appreciate very much.

Where can I get the rest of the volume after I have finished these two, and how much it is in Malaysian Ringgit?

Once again, a big Thank You and all the best in your future.

Yours Sincerely,