The cheaper alternative is simply eating less food. Altrought be careful to get enough calories and protein (0.8-2 g/kg of body weight) in your diet.
The recommended calorie deficit for weight loss is 500-1000 calories or 0.5% of bodyweight per week.

Your daily caloric intake is depented on activity level, weight, height, body fat % and gender.
Estimating the daily caloric allowance for you (light activity, 92 kg, 182 cm, 30% body fat, man) is 2500 calories for weight maintaince.
So for mild weight loss you should aim for 2000 calories per day.
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