Congrats on your new purchase !
I too went thru a phase where I had to buy stuff for Wendy on a shoestring budget. Wigs was one of those items, and I bought wigs that were costume wigs for around $10 – 15.
Like your experience, they were ok, but didn’t look realistic and tangled incredibly easily, but overall did the job in a pinch.
Overtime, I increased the budget to $80 then to around $250, and I wear the wigs I bought for $250 all the time. I only use the costume wigs if I am doing something that may impact the integrity of the good quality wigs, like cooking.