Check your airline's luggage allowances. Most charge $15 for the first bag and $25 for the second. (Each way.) 3rd or 4th bag rates jump considerably. Most airlines don't hold snowboard / ski bags to the size restrictions, just to the 50# weight restriction.
I just got back from a trip. To keep on the cheap, I packed light with my board and all my clothes in just my board bag so I could get away with 1 bag for the whole trip. (Didn't feel it was worth another $25 x 2 just to haul more clothes around in a 2nd bag.) I took my boots in my backpack as free carry-on. If you have a separate boot bag, I believe you can check a board / ski bag and a boot bag in as a single piece of luggage, however.
Make sure to leave a little room in your bag(s) for shopping finds on the return flight.