We bought (my training partner and I) 2 used wingers, really good ones, for $600 roughly. It included one set of electronics, we don't really need 2 at this point. The thing with wingers is you have to re-load them after each bird, so you really don't want them out in the middle of a field anyway if you can put them near a side line etc. where you can easily access them.
The other problem with wingers is that you probably should have someone out there to help the dog if they run into a problem if you are running a novice dog (as we all are!). If you're going to have someone out there, you really don't need the electronics on them yet. If there are 3 of us, we generally don't use the electronics anyway because we have someone by each winger to help if needed and someone running their dog.
Bumper boys, on the other hand, can launch several bumpers and if the dog needs help you can launch another bumper. But they are very expensive, and don't launch birds!