The more popular one would be Ilford HP5 and FP4. I believe you can purchase them in Ruby (located in Penisular Hotel). As for how much, I'm also not very sure as its been some time since I last shoot B&W.
First timer, I would suggest an ISO400 film, like Tri-X or TMAX400. HP5 also can.
After that either send to Ruby or Riceball book shop for the traditional process. Quite affordable. Just wait a few days. Quite affordable. (you have to learn to be patient when dealing with film stuff).
Then next step, try to join your NTU photo club and learn how to do processing and printing yourself.
You might want to consider google.com or wikipedia.com to answer your questions. Just a few clicks away....
Price? Your best bet would be to call Ruby directly to avoid disappointment les someone tells your a different price and you get surprised when you actually drop by Ruby. But since you've asked, I doubt it'd be more than $7, which is the price of Ilford Delta3200 (my benchmark for pricing). But I may be wrong....again, call Ruby to confirm.
Each make has a different tone curve so the best way is to try everyone of them and decide which one you like. Personally, I like Kodak TechPan, Fuji Acros100, Kodak Plus-X and Tri-X in order of ISO sensitivity.
If you're comfortable with it, I would also recommend bulk-loading the film and it will definitely save a fair bit on cost. On the note of cost-saving, I would also recommend learning how to develop the film; google for "diafine"; a long-lasting 2-bath compensating developer that is dead-easy to use (non- time/temperature dependent), and you'll normally get a speed bump due to the compensating nature
Bulk-loading means instead of buying films in 12-exp, 24-exp or 36-exp per roll, you buy film in a big uncut roll, normally a 100ft, and you manually load the film into empty film canisters (reusable once or twice @ 20cent each??) yourself. Generally, 100ft, cost about $50 (depending on make/model), will give about 18+ 36-exp rolls.
main problem with bulk loading is probably getting excess to a dark room and finding yr fav film in bulk rolls. ruby only stocks kodak Tri-X but me n my fren ordered in HP5 thru them. we've loaded one roll of Tri X so far. not too difficult but make sure u have a partner and plan everything out.. we spent about 3-4 hours loading.. the first few set ups slowed us down but after tt things get easier. its not too diff and the price of the film is effectively halved=P
as for fav film.. i love fuji neopan400.. but its rather ex at 6.50 a roll so i keep about one or 2 rolls for when i feel happy for shooting=P other than that.. tmax100 seems nice and i ve got a roll of ilfor panf50 im looking forward to use when i find the time to shoot it=P i think the best compromise is 400spd film esp when shooting rangefinders.. the grain is just v nice when shooting bw=P for slr shooting i think,. i shoot almost exclusively 400 spd cos of the mirror shake, and the fact tt i use 105mm and 135mm lenses on my minolta SRT.
u might wanna try some films see which u like better.. the preference of texture really differs from one to the other.. happy shooting!=P