For my money, the words, "You Get What You Pay For" were never more appropriate than with a five-string bass.
I bought a budget model to see if I liked it, re-sold it and recovered my total investment, and then spent serious coin on a serious fiver. Sooo glad I did.
I agree with this to a point, perhaps with budget basses purchased new, don't expect it to have expensive features without paying to upgrade it or buying another bass altogether. Some options are bad altogether and understandable why they're so inexpensive.
Now buying used really depends where you live and this is where you can often find the best finds for your money.
Where I live, there's a sweet Ibanez SR505 for $250 right now- I can mention that because my wife will kill me if I buy another bass right now. Not a bad bass for the money. I also bought my MIM Fender Jazz V for $200 in fantastic condition 2011 model, burgundy which if I remember correctly I traded it for a 4 string MIM Jazz in the same color and condition. Recently my son found a Yamaha TRBX305 for $100 (pic above) which included a practice amp.