Most of the Honda's oils are SM grade, very expensive and being bought from Total. And filters price is almost double than outside. They are just making/sourcing filters from some local company (prepared in house and not even some factory) and prices are very high.
We are selling Reborn's oil filter (Leepon's, Malaysian) at Rs. 460/- only.
And airfilter is ~ Rs. 550/- (I think).
For Oil, it depends that what change interval is required.
For Longer CI, 5/40. 8~10K
For Fuel Economy, 5/30, 5K
But far better oils are available than Honda's own oils. Try to choose LM, Kixx, PTT. Presently these three companies are good.