Wow my official first post and walleyes are something I just found out a lot because I've been trying to get some too.
Well luckly I live in Minnesota and there are die hard game fish people here, we even keep game fish as pets. Right now I have 2 walleyes, 1 large mouth bass, and 2 crappie, well one just died. There are around 5 pet shops in the Twin cities metro area that I know carry game fish. The walleye I bought cost $13.99 but one place sold them for $20 each
They are all about 2-3" only but that's where you want them because eventually they'll outgrow the tank. No worry they'll be good eatin....J/K I would never. If you got a fish farm hatcher around your area then yes it's a good place to buy them. They are a lot cheaper at the fish farms, usually $3-$8 only for a fish but you might have to buy a lot of them. These fish farms usually do buisness with people that have private lakes or ponds and buy a lot of baby fish to stock up for the future.
If you don't have a place around you then I suggest don't buy them out of state because the shipping cost an arm and leg. The reason is you need to ship them overnight to be safe on the fish. I got a quote on 4 4" walleyes from a place in NY and it was $100 totaled with shipping

$25 bucks for the fish and $75 for the shipping, man forget it.
Best thing to do is just use the internet and search all the pet shop around you and ask them. It'll be hard because petshops need a special license to sell game fish and if people don't buy enough then it's not worth the extra money to buy the game fish license.
Well hope I helped, any questions just ask. I talk like a pro but stay tuned, I will be asking many question about native fishes cause I just learning myself.