I agree the K cups are rather expensive but in my situation buying five drip coffee makers due to mold kind of balances it out for me. I don't know the differences of the various Keurigs sold but mine has a plastic vial that you can put ground coffee in so that you can use your choice of ground coffee and then empty the vial and refill. But since I have the issues of squalor and not cleaning promptly the kcups have solved so many problems and it is worth extra cost. '

If I can get my kitchen sink unclogged I might try the vial you fill, clean and reuse. I tried plunging my sink and tried Drano. Yesterday when I was in Kmart I bought a bottle of Drano that has a ~18 inch 'snake' to try and if the snake doesn't work my only option will be plumber.