Sounds like a decent deal to me.
Some factors to consider would be:
- Do you like paddling it (can you try it?) You should really test paddle any yak before you drop that kind of money.
- Condition of yak and accessories
- Type of FishFinder (DSI/Sonar/Both)
- Your intended use (salt vs fresh water)
You could probably spend less then that to get a setup but it would take some time depending where you by from. If you're looking to get fishing asap then maybe it's a good fit.
Good luck