Hi Jindo, I'm not sure where you're based, but try googling kitchen supplied in your area
I've used these cabinets in 4 kitchens I've remodeled in the past 4 years! (click to go to shopping link) I LOVE them! They aren't the most expensive or the cheapest, but they are very well built and very reasonable. Click here to see my son's kitchen we remodeled and used them in.
If you have a Southeastern Salvage in your area that would be my recommendation for unfinished cabinets. I have bought them for my bathroom and laundry room, some painted & some I stained. They have held up wonderfully. Very good products. I think they also have finished products now.
Home Depot and Lowe’s are two places you could try.