If you use Topo! or Topo!Explorer, its a free download through the software. http://www.natgeomaps.com/hunting#GMU
If you're handy you can download a piece of software called GPSBabel to convert any GPS format to any other GPS format. In this case, a Topo! .tpo to whatever Garmin format you want. (.gdb? .mps?)
If you're not that handy, let me know what Garmin format you want it in and I'll post it here for you today. Also, do you want ALL the game units, or just a couple of specific ones? If so, I'll need to know which ones. The .tpo file with all of them is about 700k. I don't know if the size will change much when the format is changed.