Yeah, I got my level 4 trainer about 3 weeks into the beginning of this season. Cost me 40,000 signing, starting salary was about 15,000. Prices were definitely higher the first two weeks of the season though. If you have the money now, I'd look into getting one
aussie dude is right though, it's the level 5 trainers that really get expensive. Add low salary and a specialty, and you are talking a lot of competition, and a lot of money.