Cheaper replacement products??

Hi everyone, so 6 months ago I went to Aus Skin Clinics to start getting some peels/micro needling and a skin care routine to improve pigmentation and scarring of my face. The products they sell are so expensive and I can’t justify spending $80-110 per bottle for these things (brand is Ultraceuticals). So I’m wondering if anyone has recommendations and experience with some replacements that I can use instead. Below is my routine. Looking to add tretinoin/Tretinol?? Lol

Daily spf50+ - non greasy/matte Morning: - Hydrating serum (B5 & niacinamide, hyaluronate. - Antioxidant protective (silymarin, Vitamin E, ferulic acid)

Night: - Mild skin tone smoothing serum (AHA’s, BHA’s, niacinamide). - Ultra hydrating lotion