Are there any affordable alternatives to Brazilian Keratin Treatments?

Hello Fluther,
I’m a 22 year old Caucasian female with wavy dark brown hair. My hair is strong and healthy as I try to take care of it and get regular trims. It straightens nicely with a ceramic straighter and the right products and I would really like to maintain this look without so much effort. I am prone to some frizz so I need something that would keep my hair sleek and manageable without shelling out 700 + (NYC prices, eek!) for a decent BK treatment. Does anyone have any advice, alternative practices or products they can share so I can keep my hair sleek and still pay the rent?

Thanks! :)