"big laptop market"
haha. You must mean house of laptops. It is one single shop, and charges exhorbitant rates.
Dell you will have to buy direct.
Acer - well man look up their site and see what model you need. I would help, but I am out of town currently. As for where to get it, well that depends. You can get it from Compuciti/House of Laptops etc. There is an acer mall somewhere, will have to look that up (possibly on acer's site, and an email to them will definitely get it). The absolute cheapest is DCC just off JM road, but they accept only cash or credit card payments. I don't know if you have a credit card with such a high limit, or if you are willingto pay cash. They have a price generally 2k below the rest, and you can save another 2k if you go and pick it up from their warehouse which is outside the city. Even if you go in an auto, it will not cost you more than 250 bux both ways (that is a very generous estimate I made). But as I said, 50k+ in cash or credit card? Ouch. Plus they will charge you 1% or so on credit card transactions....
Toshiba - well you get them all over the place now (earlier it was a real challenge). Compact, Baba computers, Compuciti (I think), Dass electronics, Central and half a dozen other places. But I have the number of a guy from HCL, some chap called Raj Rajendra, and he had once quoted me a cheaper rate than the mkt. I will get that across to you once I return to Pune on the morning of the 20th.