26/36/48 actually sounds pretty good to me. I can't seem to find any that aren't 28/38/48. I was successful changing the granny of a Truvativ Elita road triple (52/42/30) to an FSA 24T chainwheel. I changed the middle ring to 39T because the mechanic at my LBS was concerned about the shift from 24 to 42. He needn't have worried, most times that shift is missed and the FD shifts from the 24 to the 52 as quick and as smooth as anything you have ever known. And as far as the wrap capacity of the RD... well lets say that the actual range of gears exceeds the recommended wrap capacity by a huge number of teeth and it has not been a problem. None whatsoever.

The first thing you need to check, as others have noted, is whether your chainrings are individually addressable. If they aren't and your chainrings are bolted together, I have seen 22/32/42 unit triples for sale, and you could do worse at that price range than just swapping out the entire crankset. If you are working with a hybrid in the over $400 MSRP chances are the crankset will be of the quality level where you can change the rings individually. Then, again as others have said, you just need to know the bolt circle diameter you need, and find a maker for a 22T or 24T chainwheel. If possible. For the Truvativ Elita the BCD was 74mm IIRC for the granny, and that meant a 24T was the smallest chainheel possible. That just might be the case in your situation. FWIW.