I need a remote for a yamaha HTR 5890 reciever. I don't want topay 100.00's for one. Please HELP!!!?

I have searched at a no. of locations, and all the places on the net are too expensive or they send you off to a million different linked sites. This is a present for my son who is turning eighteen in one month. I work about 14 hours a day and it is difficult to divide my time with all the diffrent things that has to be done in a day. ( Boo Hoo!) I know everyrone has the same problem, but I'm very technologically challenged and could use some help. Humbly yours, Michael Myers.( yes that's right, it's my real name)