Mark,
The procedure to order from DTG is quite simple:
e-mail them at dtgcd@hotmail.com with the following in English:

"Hi DTG,

Please send me the following CDs:
m231
m772
m566

My adress is:
Fred Bloggs
Hotel Twinky Room 69
Sukumvit Soi 27
10220
Bangkok

I will pay into your Bangkok Bank account if you tell me the number and name.

Thanks,

Fred Bloggs"

They will e-mail you back with a price and account number and order number to quote in your reply when you confirm payment.

Pay into a BKK Bank branch(take a copy of DTG's e-mail and show to bank teller if you like...it contains nothing sexy) and note the record number/payment reference number. Then e-mail back with this number and the order number...or just reply to the original message from them and leave the text of their message attached...and within 3 days, the package will arrive.