Discount Coupon Bonus

products = {'Shirt': 8, 'Shoe': 12, 'T-shirt': 4, 'Jacket': 15, 'Book': 2}


def bonus(product, param=''):
    if product in products.keys():
        if param == 'MONEY':
            if float(products[product]) - 5 < 0.99:
                return 0.99
            else:
                return products[product] - 5
        else:
            return products[product]
    else:
        return f'{product.title()} - Not in stock!'


print(bonus('T-shirt', 'MONEY'))