I found one on eBay a month ago, it's still available now.
http://www.ebay.com/itm/322220223412

I tried to buy it, but since I'm newbie on eBay (zero feedback), the owner cancelled my bidding 

As OP(@lex) and others bought:
Replace all electrolytic capacitors on PSU board, and other failed components.

Several users in this thread had already made a buy-list, you may have a look and make some changes if components are out of market.

For other failed components, you may check others posts (one by one) in this thread to see which components they had replaced, and check yours to see if you need to replace them (or wait for a professional engineer to diagnose which components caused your IRF740 been burned).
You can buy from

• DigiKey
  
  
• or Mouser
  
  
• or element14
  
  
• or others
  
  

Those are suggested suppliers by OP and others.

The price of components on their websites are expensive, but they guarantee components are genuine.

I live in China mainland as written in my profile.

It's actually @rsseco are going to buy components, not me.
Anyway, good to know RS Malaysia, now we have more choices.