Gerardo, they sell them at Cabela's. I also use a mountain bike for traveling to and from my sites. Duplicolor makes drab temporary spray paint that you can use to go stealth mode, then at the end of the season, you can use a high pressure nozzle on your garden hose to remove it. My bike is neon yellow before the season, then flat black during it.
As far as a bike rack is concerned, my longbow fit perfectly on the back of my Badlands pack, but this year I'm going with the ATV rifle mounts as my feathers were getting sandblasted from the gravel muck, and my arrows were sliding out of my bowquiver without me realizing.