Yes, you should think about how much you are worth, and aim for that pay. However, in hourly positions, you don't really have the option to negotiate. They may ask what type of pay you are looking for, but usually what you say doesn't matter because they already have a determined pay rate.
According to the latest estimates, the cost for taking the HESI exam can range anywhere from $35 to $70. Costs vary according to the institution administering the test and you should contact your chosen location for details on this.
How much is it? On average, the price of a nerve conduction test is going to cost anywhere from $700 to as much as $4,000 if additional tests have to be performed. Most tests will fall in the $500 to $1,300 per extremity. If deemed medically necessary, check with your health insurance provider to see if they cover a procedure such as this one.