SA for men is something like $70 or so, but of course you will need to consult a doc to interpret the result. Then for women, doc will usually do simple ultrasound scan (cost about $80), but more in depth checks of the tube may be required and cost more (maybe $150++, cant remember)
We went to Thomson fertility clinic last time to seek some help. My wife and myself were found OK, but we tried for sometime with clomid and didnt work. Finally, we gave IUI a try and it did not turn out well too. Dr Cheng was our consultan, and he is a good doc.
We then decided to give ourselves a break and take things easy with traditional chinese medicine. We found a chinese physician in Marine Parade and followed his precription and advice for a few months...now we just realized that my wife is 5 weeks preg!
Well, having gone through all these, my advise is that it is still good to consult fertility doc first to get all the necessary checks, then you can try Thomson Medical Center, which may take longer time than western doc. They target to strengthen your health and go for natural conception.
Hope you have gotten the answers you want and all the best to you.