During the week, you can visit on Wednesday as they have a campus night special for students. It is darker, the music is more aggressive (trance, funky house, trap), and I suspect that alcohol is only the second most popular party substance. You can get a KTV room with 3 bottles of whisky for Rp2,700,000.
They have several packages, the cheapest one cost Rp1,000,000 for the room/10 beers and the most expensive Rp2,900,000 for the room/2 bottles of whisky.
The options for sleeping in Bengkulu are limited but they are all rather cheap.