There are several websites that offer domestic venison. However, keep in mind that it will be significantly higher than beef, pork, or chicken. The last time I checked it, the price average was around $11.00lb. (Not including shipping.)
Keep in mind that it is illegal to sell wild venison, so your only option is to either start hunting, find a friend that does, or buy farm raised.
I just did a Yahoo search of "Farm Raised Venison" and it returned 1800 sites. You should be able to find what you want quite easily.
Good luck,
Dave