Buy an instrument, which meet your own requirements if you know what you needs are.
Talk to Mr. Adrian Maruszczyk he is a nice man and he will guide you.
That is the Cheapest way.
By getting it right the first time, you will not need a new bas after 6 month.
I just love my Maruszczyk Elwood and I have had for about 1,5 year know.
Best regards
Svend