Since the farms are tilled/owned by different farmers, improvised fences were put up as boundaries/separators. However, they have standard price per kilo or basket (but you can always try to haggle). Pre-picked strawberries cost P100/kilo, while it costs P200/kilo if you will be the one to pick the strawberries. The 100% difference is the price you have to pay for the "experience".
Due to the heat, pickers only reach the easily accessible farms near the entrance. Hence, they were almost saturated; what's left are small, unripe strawberries. As a tip, go to the "inner" farms where you'll find bigger & ripe fruits.