I had that routine before, but I always have something else to do, i.e, reading newspaper I haven't time to read during the day (no time browsing), listen to good music, reading books, gardening, watch tv, now EP! I don't know if with all those I can still get bored!
go hiking. all you need is time. or go fishing. all you need is time and bait.
camping is a pretty cheap hobby. it becomes more of a way of life then a hobby.
I do mystery shopping. you only do it when you are shopping anyway so you dont need to make time, you get paid for it (only pocket money though) so you dont need money.
YOu have to love the hobby or it won't happen. Loving a car or working in your yard could be a hobby. It doesn't have to be model air planes or an insect collection, but it could be if you love the butterflies.
be a watch repairer