I just came back from Spring Training (video evidence available). I've been going for years and we've learned to just buy "berm" seats to games. They've all increased in price, but we paid $118.75 USD for 5 berms seats and parking at the ATL @ TB game in Port Charlotte. So $160 CAD for my family of 5 to go ($32/person). We did sit on the berm a bit (which gave access to autographs and balls to be thrown from outfielders, etc.), but there is always open seats so once we got too hot, we just moved to some open seats. We often cruise around and check out different parts of the park as the game goes on (go stand near the bullpens for a bit, move to bar areas, etc.). It's so laid back, if you miss an inning or 2, it's no big deal. That's the cheapest way to watch a TB spring training game.
The game in North Port (Atlanta Braves home) was MUCH more expensive. My parents and brother came to this one and they're old, so we got them seats in the upper deck, under shade for $45 each USD. Berm tickets were $20 each. I got 4 seats and 4 berm tickets and it was $313.20 USD ($424 CAD) for 8 of us to go ($53/person). It's a brand new park and it was gorgeous - but not as affordable as one might think (especially when you add in a few beers and hot dogs).