i think that "inexpencive" means "barato" and economico means "economic".. like: un coche caro a veces es economico.
not generally, in a context like this it would always be cheap, inexpensive.
There's a lot of subtext to cheap (at least in my experience), particularly in regards to quality. If someone wanted to say that something did not cost much without saying it was of poor quality, they might prefer 'inexpensive' to 'cheap'.
Personally, I tried out 'thrifty' as an alternative. It was not accepted, but I have reported it.
The slow audio is different to the 'normal' speed once again. Normal says tenian, slow sounds like it says tambien or tendrian.