Within reasonable budget, so basically under a tenner!!!
My hair is just past my shoulders, probably over-dyed, in not too great condition, so a bit dry & split. I do blow dry it with a big round natural bristle brush, but only straighten it about once a week. Looks frizzy although it's fairly straight.
I usually spray it with VO5 heat defence spray before blow drying it. Then work some VO5 serum through the lengths and ends. I accept it'll never look magazine glossy, but it just looks awful. Even straightened it looks crap. I get it trimmed about every 3 months or so, really trying to grow it long again. Ive tried lee Stafford Argan oil, which can make my hair feel dry and knotty the next day so not a great fan of that & didn't notice a great difference either. Anything else I can try?