Lice worth it ?

So I feel like I might have lice and I noticed white small stuff on my daughters hair that she didn’t have before. Ever since we came back from Mexico. Well I have tried Mayo & even bought these treatment from Walmart I feel like their still there and I can’t check my own head. I found this clinic that specializes in Lice. And they charge I think $180 and guaranteed lice free. They check your hair with comb , treatment , and add other stuff . But it will be for my daughter and I so like total for everything is $360 . Is that a lot ? To get checked ?