^^ Go to Nawa Shehar Chowk, there you will find many options for keyless entry, prices start from Rs.2,000 to Rs.8,000 depending upon quality and features. All are Chinese but they work well, I have been using Rs.2500/- keyless entry in my older car and it worked flawless.
If you live in Shah Rukan-e-Alam Colony, then best place to visit is "Innovators", its near Daewoo Terminal. They are a bit costly but got only quality stuff.
And yeah, even if you choose to install new Keyless entry system along with new key, still it will cost you less then Honda Quote 